单项选择题

The reason why I study medicine is ______ I can ease the sufferings of the patient.

A．that
B．why
C．in that
D．in which
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单项选择题
It must have rained yesterday evening, ______ the ground is wet.
A．since
B．while
C．for
D．because
单项选择题
So long as we put our heads together, I'm sure that we will certainly find a(n) ______ to the problem.
A．approach
B．key
C．answer
D．solution
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