单项选择题

Judging from what he said, Jack seemed ______ everything already.

A．understand
B．to be understanding
C．understandable
D．to have understood
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Those ______ want to watch the football match please hand in your money after school.
A．who
B．which
C．that
D．whom
单项选择题
I have no doubt ______ he will get through the examination.
A．whether
B．as
C．that
D．if
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