单项选择题

He said that books on ______ popular science are in ______ short supply.

A．the; a
B．/;/
C．/;the
D．the; the
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单项选择题
I have kept that picture ______ I can see it every day as it always reminds me of my university days in London.
A．in which
B．which
C．where
D．when
单项选择题
--How can I mend it--Well, look at ______,please.
A．explanations
B．expressions
C．instructions
D．introductions
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