单项选择题

______ that I am well again, I can go on with my work.

A．For
B．Now
C．Since
D．Despite
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单项选择题
You must be careful ______.
A．in future
B．in the future
C．after future
D．on the future
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．before
C．after
D．when
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