Question

---_________  the team finished most of their research work?
---Yes, but the rest        rather difficult

1. A.
   Has, are
2. B.
   Has, is
3. C.
   Have, are
4. D.
   Have, is

Answer 1

D
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。