问题补充：
Half of the class done most of the work. The left rather hard.
A. have ; is
B. has; is
C. have ; are
D. has ; are
答案：
(答案→)A. have ; is
B. has; is
C. have ; are
D. has ; are
解析：此题重点考查主谓一致问题。根据语境可知the class是可数名词，the work是不可数名词。
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