单项选择题

High grades are supposed to ______ academic ability, but his actual performance did not confirm this.

A. certify
B. clarify
C. classify
D. notify
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单项选择题
Professor King's book will show you ______ can be used in other context.
A. that you have observed

B. that how you have observed
C. how that you have observed
D. how what you have observed
单项选择题
The doctor had almost lost hope at one point, but the patient finally ______
A. pulled out
B. pulled through
C. pulled up
D. pulled over
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