问题
选择题
They looked _____ each other and kept their secret _____ themselves.
A．for; to
B．at; for
C．at; to
D．out; at
答案
答案：B
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。
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