单项选择题

______, he finds the work interesting.

A．Though he is computer expert
B．A computer expert he is
C．As computer expert
D．Computer expert as he is

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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

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

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