单项选择题

How did it（）that you didn’t report this to us in good time

A. come about
B. come across
C. come around
D. come at

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单项选择题
She is an（）girl; she does everything her parents ask her to do.

A. exclusive
B. imperative
C. obedient
D. empirical
单项选择题
He tested this（）experimentally, and found that his results were consistent with the idea.

A. detection
B. formula
C. hypothesis
D. statistics
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