单项选择题

______ after a long walk, Harry called and said he couldn’t come.

A. Having worn out

B. Be worn out
C. To wear out

D. Worn out

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单项选择题

______ as it was at such a time, his work attracted much attention.

A. Being published

B. Published
C. Publishing

D. To be published

单项选择题

He must have had an accident, or he ______ here then.

A. should be

B. would be
C. could have been

D. would have been

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