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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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
单项选择题
She is always the first ______ to school.
A．coming
B．to come
C．to have come
D．having come
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