单项选择题

Anesthetics are used()insensitivity to pain during surgical operations.

A. the cause
B. to cause
C. cause of
D. causing

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单项选择题
Evidence came up () specific speech sounds are recognized by babies as young as six months old.

A. what
B. that
C. which
D. whom
单项选择题
The speech (), a lively discussion started.

A. to deliver
B. be delivered
C. delivering
D. having been delivered
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