The number of the birds in the zoo _______ about ninety.

A. am
B. is
C. are
D. be
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科目:初中英語(yǔ) 來(lái)源:期末題 題型:單選題

The number of the birds in the zoo _______ about ninety.
[     ]
A. am
B. is
C. are
D. be

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