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。剩下的稍微難點�？疾閯釉~時態(tài)辨析題。half of the class班上一半的學(xué)生，是復(fù)數(shù)人稱，需用have+done構(gòu)成現(xiàn)在完成時，可排除AD兩項。the left剩下的（另一半），也是復(fù)數(shù)人稱，系詞需用are，可排除AB選項。根據(jù)句意語境，可知選C。
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