单项选择题

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

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

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单项选择题

It's better to avoid （） downtown during the rush hour.

A.to drive
B.having driven
C.to be driving
D.driving

单项选择题

（） a taxi, otherwise you'll miss your train and the ticket will expire.

A.Taken
B.Take
C.To take
D.Taking

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