单项选择题

What should listeners do

A．Prepare a response
B．Organize a meeting
C．Design new products
D．Confirm the figures
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单项选择题
A．has facilitatedB．will facilitateC．facilitatingD．had been facilitating
A．has facilitated
B．will facilitate
C．facilitating
D．had been facilitating
单项选择题
A group of neighbors ______ the fire burning in the building by the time emergency responders arrived on the scene.
(A) had extinguished
(B) extinguished
(C) extinguishes
(D) will have extinguished
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