单项选择题

Now that in scientific communities the use of computers is widespread, and supposing that there is sufficient time, there exist no complicated problem ______ can be addressed with some hope of resolution.

A．and
B．but
C．as
D．which
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单项选择题
The car ran out of gas! That ______ the cause. I filled the tank this morning.
A．mustn't be
B．must have been
C．can be
D．can't have been
单项选择题
A good indication of ______ he followed the teacher's advice was that he failed.
A．what little
B．however little
C．how little
D．whatever little
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