is it time we____ our work now a begin b began c have begun d will begin

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• By the time he was 15,the boy___to make a living by himselfA.would begin B.has begun C.had begun D.began
• he is one of the world-famous musicians,by the time he was six,he composinghe is one of the world-famous musicians,by the time he was six,he composingAhad begun B begins C would begin D have begun.为什么不选D而选C呢
• 1.Only after a year ( ) to see the result of my experiment.A.I began B.I had begun C.have...1.Only after a year ( ) to see the result of my experiment.A.I began B.I had begun C.have I begun D.did I begin2.( ) in the fields for two hours,they took a rest.A.Having worked B.Working C.Worked D.Being worked为什么第一题c为什么不对
• only a after year -----to see the result of my experimentA.I began B.I had begun C.have I begun D.did I begin
• 1.If the whole program _____ beforehand,a great deal of time and money would have been lost.A.was not planned \x05B.were not planned\x05C.would not be planned D.had not been planned2.Isn’t it about the time you ___ to do morning exercises?A.began \x05B.begin \x05\x05C.should begin \x05D.have begun3.He told me how he had given me shelter and protection without which I ___ of hunger.A.would be died \x05B.would die\x05\x05C.would have died \x05D.will die
• since i.school,I haven't had much spare time.A.begun.B.began C.have begun.D.begin请帮我选正确答案以及原因
• is it time we____ our work now a begin b began c have begun d will begin
• 不知道这个点还有没有人 Sales of CDs have greatly increased since the early 1990s,when people __ to enjoy the advantages of this new technology.A.begin B.began C.have begun D.had begun 为什么选B不选CThe discussion___ alive when an interesting topic was brought in.A.was coming B.had come C.has come D.came为什么选DIt is said in the book that Thomas Edison(1847-1931)___ the world-leading inventor for sixty years.A.would be B.has been C.had been D.was为什么选D
• The play may begin at any moment .It ()A has begun B won't C hasn't begun yet D began a long time ago
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• 因数、倍数、公倍数等等,(小学的)公式、定义是什么?