The Blacks ___ in this factory since 1998 A has worked B has come C have been Dhave arrived

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• The Blacks ___ in this factory since 1998 A has worked B has come C have been Dhave arrived
• 1.When he arrived at the bus stop,the bus ________ for 20 minutes.A.has left B.had left C.has been away D.had been away2.I ______ the League for 5 years so far.A.joined B.have joined C.have been in3.The factory ________ since the February of 1988.A .has been open B.has opened C.was open D.opened4.Mary and Rose _______friends since they met in 2000.A.have made B.have been C.made D.have become5.You mustn't ________ until he comes back.A.be away B.leave
• The Blacks ___ in this factory since 1998 A has worked B has come C have been Dhave arrived
• Lucy has been cleaning the house since came back home.has要不要改为had
• His sister left home in 1998,and-----since.A has not been heard of B has not hear of 不知道为什么选A,运用的什么英语语法,