单项选择题
It is certain that the time has come when man travel in the outer place.
A.人们能到外层空间旅行的时代已经到来,这是肯定的。
B.当人们在外层空间旅行的时候,无疑时间已经到来。
C.人们肯定能到外层空间旅行的时代已经来了。
D.毫无疑问,人们能到宇宙太空旅行的时代已经到来。
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单项选择题
They had to give up the program for lack of investment funds.
A.因为缺乏投资资金,他们只好放弃了这个计划。
B.为了获得发明资金,他们必须放弃这个计划。
C.他们必须放弃这个节目,因为它需要投资资金。
D.为了减少投资资金,他们只好放弃计划。
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单项选择题
Not until I began to work ______ how much time I had wasted.
A.have I realized
B.I have realized
C.did I realize
D.I realized
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