单项选择题

--When can I come for the photos I need them this afternoon.
--They should be ready by 12 o'clock. You can ______ us sir.

A．wait on
B．watch on
C．depend on
D．call on
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单项选择题
It's too late to go out, ______ it's going to rain.
A．otherwise
B．besides
C．however
D．therefore
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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