单项选择题

()second thoughts I'm quite content to stay for the time being.

A. At
B. On
C. In
D. As

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Not once in these years () the prices of these products.

A. we changed
B. have we changed
C. did we change
D. we have changed
单项选择题
Sam did nothing else than () when he saw the old lady fell down on the ground.

A. stand by
B. standing by
C. stood by
D. stood up
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