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
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() 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
单项选择题
Mr. Wang and his son, both looking very happy, () taking a walk in the park.

A. are
B. is
C. has
D. have
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