单项选择题

Not until I wrote to him _________ that I was also in America.

A．had he known
B．he knew
C．he didn't know
D．did he know
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单项选择题
Several months has already passed, but she is still ____________ with her failure at the speech contest.
A．concentrated
B．obsessed
C．engrossed
D．penetrated
单项选择题
Don't be too ____________ on them; after all, they are only little children.
A．strict
B．strong
C．hard
D．heavy
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