单项选择题

This is Mr Smith, () I think has something interesting to tell you.

A．who
B．whom
C．that
D．/

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单项选择题
--Why does Sara know so much about Angkor Watt --She () have been there, or because of some other reasons.

A．must
B．oughtn't to
C．may
D．can't
单项选择题
His mother works at the market()sells vegetable and fruits.

A．where
B．in which
C．at which
D．which
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