单项选择题

When the bell rang announcing the end of class, students came out ______.

A. by twos and threes
B. by two and three
C. by two or three
D. by twos or threes
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I asked him whether he had done all the work himself ______ he had had any asistance.
A. and
B. but
C. nor
D. or
单项选择题
One of the men present held the view ______ the book said was right.
A. what that
B. what
C. that
D. that what
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