单项选择题

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

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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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Is the average temperature of Shenyang in summer().

A. like Chicago
B. like it in Chicago
C. like the one of Chicago
D. like that of Chicago
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