单项选择题

When you read the book, you'd better make a mark（）you have questions.

A．which
B．at where
C．the place where
D．where

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单项选择题
Jack（）yet, otherwise he would have telephoned me.

A．mustn't have arrived
B．shouldn't have arrived
C．can't have arrived
D．need not have arrived
单项选择题
No matter what you say, I shall（）my opinion.

A．carry out
B．keep up
C．insist on
D．stick to
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