The number of students in a foreign language class
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The number of students in a foreign language class _ usually limited to no more than thirty.
A.have B.are C.is D.were
选C因为主语是【the number of sth】解释为...的数量
谓语动词用单数
======以下答案可供参考======
供参考答案1:
C.is供参考答案2:
THE NUMBER OF 是。。。。。的数量,因为NUMBER 是单数所以后面的谓语动词用单数形式