--- the class done most of the work? --- Yes but the rest rather difficult.A. Has areB

问题补充：

--- the class done most of the work?

--- Yes, but the rest rather difficult.

A. Has, are

B. Has, is

C. Have, are

D. Have, is

答案：

A. Has, are

B. Has, is

C. Have, are

(答案→)D. Have, is

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