单项选择题

As I was just getting familiar with this job, I had ______to ask my boss.

A．many
B．most
C．much
D．more
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单项选择题
Most trains______ long distances have a dining car and a club car where refreshments are served.
A．to go
B．to be going
C．that goes
D．going
单项选择题
The ability to store knowledge makes computers different from every other machine______ invented.
A．ever
B．thus
C．yet
D．as
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