Half of the class       done most of the work. The rest       rather difficult.
A．has, isB．have, areC．have, isD．has, are
C
考察主謂一致.這里的class指的是學生們.一半學生也是復數(shù),rest其余的,為抽象名詞,不可數(shù),用單數(shù),故選C.
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