单项选择题

Alice received an invitation from her boss, ______ came as a surprise.

A．it
B．that
C．which
D．he
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单项选择题
Paul doesn't have to be made ______ . He always works hard.
A．learn
B．to learn
C．learned
D．learning
单项选择题
You will be late ______ you leave immediately.
A．unless
B．until
C．if
D．or
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