— the team finished most of their research work?—Yes but the rest rather difficult.A. Has

问题补充：

— the team finished most of their research 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

解析：考查主谓一致。the team指代的团队的所有队员，故谓语动词用复数。the rest指代上句中的research work，为不可数名词，故用单数。选D。