单项选择题

The house was very quiet, ______ as it was on the side of a mountain.

A．isolated
B．isolating
C．being isolated
D．having been isolated
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单项选择题
To have a computer without being connected to the Web is like having an old radio when everybody else has a color TV. That helps explain ______ businesses are setting up Net sites even though profits are nowhere to see.
A．reasons
B．the reason for
C．why
D．why that
单项选择题
Problems caused by ______ nationality have to be properly coped with.
A．mutual
B．bilateral
C．binary
D．dual
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