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
He said that books on______popular science are in______short supply.
A．the; a
B．/; /
C．/; the
D．the; the
单项选择题
A heavy snow______a good harvest year.
A．means
B．shows
C．promises
D．permits
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