【括号里为答案】( C)he regularly checked his secret drawers,_______were stored some precious paintings and jewels.
A that B which Cwhom Dwhose【为什么不选B,这里where怎么作主语?】
( D)Tom ,_____help Mike climbed the mountain,was one of the first professional guides.
Awho Bwhose Cwith whom Dwith whose【为什么不选A】
(D)About a thousand species of animals are in danger of extinction,and the rate___the are being destoryed has increased.
A.which Bthat Cby which Dat which【求解释】
(C)Those were the assistants________to do the research work in the lab.
A.to whom it was their responsibility Bwhose responsibility there was
C.whose responsibility it was Dof whom responsibility was
【求解释】