单项选择题

I am afraid I am not fit for the job, for it is ______ calling for much patience.

A．which
B．what
C．one
D．that
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Though they may not succeed, ______ they will still try.
A．but
B．yet
C．that
D．and
单项选择题
We must not get discouraged ______ such a minor setback.
A．because
B．because of
C．owing
D．since
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