单项选择题

I am reluctant to use the strategy（）it serves a very clear purpose.

A．when
B．unless
C．as long as
D．as soon as

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单项选择题

They cannot be brother，（）they do not resemble each other at all.

A．but
B．still
C．for
D．then

单项选择题

（）you suspect something，I may as well tell you the whole truth.

A．Since
B．Until
C．After
D．While