When will your mother come back?____ A.Until tomorrow B.Until yesterday C.For a long time D.Not until tomorrow

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• When will your mother come back?____ A.Until tomorrow B.Until yesterday C.For a long time D.Not until tomorrow
• When will your mother come back?____ A.Until tomorrow B.Until yesterday C.For a long time D.Not until tomorrow
• When will your father come back?____-A.Not until tomorrow B.For a long time C.Until tomorrow
• When will your father come back?____-A.Not until tomorrow B.For a long time C.Until tomorrowD.yesterday
• 1.It was not until December 31 __________ we heard from him.A.which B.when C.that D.then2.At one time we had about eighty people here who did nothing but __________into various family history.A.researched B.research C.researching D.to research3.— How __________ will you be able to come back from you travel?— In a couple of weeks,perhaps.A.fast B.long C.often 4.Your hair needs __________.You’d better have it done tomorrow.A.cut B.cutting C.to cut D.bei
• ．--Did Mike have a good time at the party?
• 已知数列{log2（an-1）}（n∈N*）为等差数列，且a1=3，a3=9． （Ⅰ）求数列{an}的通项公式； （Ⅱ）证明1/a2−a1+1/a3−a2+…+1/an+1−an＜1．