单项选择题

Water, when boiled, always （）steam.

A. gives in
B. gives up
C. gives off
D. gives away

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单项选择题
John's score on the test is the highest in his class, he （） very hard.

A. must have studied
B. should have studied
C. must study
D. should study
单项选择题
No conclusion has been（） yet.

A. achieved
B. reached
C. attained
D. arrived
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