单项选择题

Not only the switches but also the old wiring （） changed.

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

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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

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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