单项选择题

By the time you arrive, I () working for two hours.

A. will be
B. can
C. will have been
D. have been

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单项选择题

I would never have believed it was possible if I ______ it with my own eyes.

A. didn’t see

B. don’t see
C. won’t see

D. hadn’t seen

单项选择题

() the most versatile of the common metals, lead was widely valued and used in ancient times.

A. It is
B. Therefore
C. Among
D. Because

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