单项选择题

Because of a lack of money, we had to ______ the plan later.

A．call off
B．call on
C．call up
D．call for
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单项选择题
As a ______ woman she was then among the few mothers who encouraged their daughters to take part in social activities.
A．sensitive
B．sensible
C．serious
D．senseless
单项选择题
You see the lightning ______ it happens, but you hear the thunder later.
A．the instant
B．on the instant
C．for an instant
D．in an instant
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