单项选择题

（）in 1943（）the harmful smog made its appearance in Los Angeles.

A、 Only... that
B、 It was... then
C、 That it was ... when
D、 It was ... that

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You（）all those calculations! We have a computer to do that sort of thing.

A、 needn't have done
B、 must not have done
C、 shouldn't have done
D、 can not have done
单项选择题
Our teacher recommends that we（）as attentive as possible when we visit the museum.

A、 are
B、 shall be
C、 were
D、 be
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