单项选择题

Not until ______ the whole thing to him ______ that he was wrong.

A．had I explained, he realized
B．had I explained, that he realized
C．I had explained, that he realized
D．I had explained, did he realize
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单项选择题
______, Mr. Brown saw the washing machine which had been repaired go wrong again.
A．To his surprise
B．It was surprised
C．Surprising
D．By surprise
单项选择题
The three children looked after their sick mother ______.
A．in return
B．by turn
C．in turn
D．on turn
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