单项选择题

Doing your homework is a sure way to improve your test scores, and this is especially true ______it comes to classroom tests.

A．when
B．since
C．before
D．after
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单项选择题
______ your opinions are worth considering, the committee finds it unwise to place too much importance on them.
A．As
B．Since
C．Provided
D．While
单项选择题
He explained everything over and over again ______ anyone should misunderstand him.
A．since
B．when
C．lest
D．as if
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