单项选择题

It’s necessary that not only ______ to see a doctor but also stay at home for a good sleep.

A. Bob should go B. did Bob go
C. Bob’s going
D. should Bob go

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单项选择题

-- Why do you look worried -- Fred left the company half an hour ago. His work ______ unfinished since.

A. left
B. was left
C. has left
D. has been left

单项选择题

______ until 1972 ______ we began studying English.

A. It was not ... that

B. It was not ... when
C. It is not ... that

D. It is not ... when

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