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
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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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