单项选择题

______, the speaker interrupted his lecture.

A．His voice was drowned by the noise
B．His voice being drowned by the noise
C．Drowned by the noise
D．His voice drowned by the noise
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单项选择题
The classroom is provided with some visual aids ______ English.
A．to teach
B．for teaching
C．to teaching
D．of teaching
单项选择题
You couldn't believe him, for he had only a (an) ______ understanding of his task.
A．perfect
B．imperfect
C．inperfect
D．unperfect
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