题目内容

Not until ________himself seriously ill.

A. he had completed the task did he find
B. had he completed the task did he find
C. he completed the task he had found
D. did he complete the task he had found

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By the time the firemen arrived, the whole building ________.

A. has burned down
B. had burned down
C. will have burned down
D. burned down

_______Charles started a job, he did it_______it was finished.

A. Since, where
B. Once, until
C. Each time, once
D. The moment, as

________the cold weather, we decided not to go out.

A. Because
B. Due
C. Owing to
D. Since

________ he will not accept the offer, I have to find someone else.

A. Until
B. Though
C. As soon as
D. Seeing that

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