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Half of the class _______ done most of the work. The left ________ rather difficult.

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

C 【解析】句意:班上有一半人完成了大部分工作。剩下的稍微难点。考查动词时态辨析题。half of the class班上一半的学生,是复数人称,需用have+done构成现在完成时,可排除AD两项。the left剩下的(另一半),也是复数人称,系词需用are,可排除AB选项。根据句意语境,可知选C。
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