单项选择题

Although he knew little about the large amount of work done in the field, he succeeded ______ other more well-informed experimenters failed.

A．which
B．that
C．what
D．where
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单项选择题
People appreciate ______ with him because he has a good sense of humour.
A．to work
B．to have worked
C．working
D．having worked
单项选择题
I' m sure he is up to the job ______ he would give his mind to it.
A．if only
B．in case
C．until
D．unless
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