单项选择题

By the time of 1969, there were many space explorations.（）

A. have been
B. must be
C. had been
D. must have been

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单项选择题
Because everyone knows, facts speak louder than words.（）

A. Since
B. That
C. It
D. As
单项选择题
Because it is not a serious problem, we are not necessary to take strict measures against the student.（）

A. we not need
B. not necessary for us
C. it being unnecessary
D. it is not necessary for us
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