单项选择题

If only I ______ how to operate a computer as you do.

A．had known
B．would know
C．should know
D．knew
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单项选择题
This small village is made up of 200 families ______ five nationalities.
A．belonged
B．belonged to
C．belonging
D．belonging to
单项选择题
______ is the effort to get a general idea instead of specific facts.
A．Scanning
B．Skimming
C．Skipping
D．Surveying
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