单项选择题

Evidence came up（）specific sounds are recognized by babies as young as 6 months old.

A. what
B. which
C. that
D. whose

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I’m still unable to make myself（）in the discussion, which worries me a lot.

A. to be understood
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If you can’t put your PC（）good use, sell it to those who really need it.

A. into
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C. to
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