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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单项选择题

It was two days later（）they began to discuss my suggestion.

A、 when
B、 that
C、 what
D、 on which

单项选择题

（）he was an old customer, the boss allowed 5% discount off the prices of the goods.

A、 Gave
B、 To give that
C、 Given that
D、 Giving that

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