单项选择题

—______your step ,Jim, or you might fall into the water.
—Oh,dear! Look where I am going.

A. Look out
B. Take

C. Watch

D. Notice
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单项选择题
When I talked with my grandma on the phone, she sounded weak, but by the time we ______ up, her voice had been full of life.
A. were hanging


B. had hung
C. hung



D. would hang
单项选择题
Sam（）some knowledge of the computer just by watching others working on it.

A. brought up
B. looked up
C. picked up
D. set up
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