They looked each other and kept their secret themselves.A. for; toB. at; forC. at; toD.

问题补充：

They looked each other and kept their secret themselves.

A. for; to

B. at; for

C. at; to

D. out; at

答案：

A. for; to

(答案→)B. at; for

C. at; to

D. out; at

解析：句意：他们互相看着对方并且为他们自己保留着他们的秘密。Look at 观看，look for 寻找，look out 当心，第二空用for表示目的，故选B。