. There are so many kinds of tape-recorders on sale that I can’t make up my mind to buy.A.

问题补充：

. There are so many kinds of tape-recorders on sale that I can’t make up my mind to buy.

A. what

B. which

C. how

D. Where

答案：

A. what

(答案→)B. which

C. how

D. Where

解析：可联系答.案.网客服索取。