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
Scientists say it may be five or ten years ______ it is possible to test this medicine on human patients.
A．since
B．when
C．after
D．before
单项选择题
There is no mother ______ loves her children.
A．which
B．who
C．that
D．but
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