My trousers are too old.I’ll have to buy .A. a new pairB. a new oneC. a pair ofD. some new

问题补充：

My trousers are too old.I’ll have to buy .

A. a new pair

B. a new one

C. a pair of

D. some new pair

答案：

(答案→)A. a new pair

B. a new one

C. a pair of

D. some new pair

解析：这句话意思是：我不得不购一条新的。