单项选择题

I know nothing about his journey he was likely to be away for three weeks.

A．if
B．unless
C．until
D．except that
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单项选择题
Living in the desert of Africa has its problems; obtaining fresh water is not the least.
A．with which
B．for which
C．of which
D．which
单项选择题
According to the passage, you make an American person feel uncomfortable if .
A．you meet his eyes friendly
B．avoid meeting his eyes
C．stare into his eyes for one second
D．look into his eyes for a long time
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