单项选择题

______! There is a train coming.

A. Look out
B. Look around
C. Look forward
D. Look on
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单项选择题
— Do you know your results — No, I don't know them ______.
A. already
B. since
C. before
D. yet
单项选择题
The patient suffering from cancer looked dead but the faint pulse proved that he was still ______.
A. live
B. life
C. alive
D. lively
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