单项选择题

The two speakers are probably_______.

A．in a parking ground.
B．at a ferry-crossing.
C．in a traffic jam.
D．at a petrol station.
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I’’m sure your suggestion will ______ the problem.
A．contribute to solving
B．be contributed to solving
C．contribute to solve
D．be contributed to solving
单项选择题
I have heard both teachers and students ______ well of him.
A．to speak
B．spoken
C．to have spoken
D．speak
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