题目内容

I've never seen the young man__next to the doctor.

A. sits
B. sitting
C. sat
D. to sit

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He bought an expensive coat_he had no job.

A. although
B. since
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D. however

David has __much work to do that he is staying late at his office.

A. such
B. So
C. very
D. enough

I didn't answer the phone__I didn't hear it ring.

A. if
B. unless
C. although
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Busy_he was, he tried his best to help us. "

A. as
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