问题
选择题
In buses, all of us _________ thieves.
A．keep an eye out for
B．are keep an eye out for
C．are kept an out for
D．keep eye out for
答案
答案：A
考查短语：当心，注意，keep an eye out for，句意：在公交车上，我们所有的人要当心小偷。所以选A。
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