题目内容

Most of the water here __ clean.

A. is
B. are

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80% cotton ___ been sent to America.

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

Half of the apples ___ red.

A. are
B. is
C. was
D. being

A number ofancient buildings __ destroyed in the war.

A. is
B. are

The number of the visitors __ decreased this year.

A. has
B. have