单项选择题

______ we have all the materials ready, we should begin the new task at once.

A．Since that
B．Since now
C．By now
D．Now that
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单项选择题
Those who spend a lot of time with children may be aware of the difference in the way boys and girls respond to ______ situations.
A．alike
B．same
C．likely
D．similar
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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