单项选择题

We’’ve just installed two air-conditioners in our apartment, _______should make great differences in our life next summer.

A．which
B．what
C．that
D．they
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单项选择题
A．imitateB．adoptC．adaptD．renovate
A．imitate
B．adopt
C．adapt
D．renovate
单项选择题
All flights ______ because of the terrible weather, they had to go there by train.
A．having been canceled
B．had been canceled
C．having canceled
D．were canceled
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