单项选择题

I am 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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单项选择题
John D. Rockefeller,______, owned 90 percent of all American oil refineries.
A．as still a young man
B．while still a young man
C．a young man however
D．in spite of a young man
单项选择题
She gave ______ directions about the way the rug should be cleaned.
A．explicit
B．brisk
C．transient
D．opaque
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