单项选择题

Give me your telephone number ______ I need your help.

A．whether
B．unless
C．so that
D．in case
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单项选择题
Those students don't have to be made ______ . They are all diligent students.
A．learn
B．learned
C．learning
D．to learn
单项选择题
We were heartedly arguing about the financial matter, ______ the telephone rang unexpectedly.
A．while
B．as
C．when
D．as soon as
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