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單項(xiàng)選擇題

There have been（）medicine in the last 50 years.

A.great advancesin
B.a great advancein
C.great advanceon
D.a great advanceon

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Would you mind（）us how old you are?

A.tell
B.to tell
C.telling
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50% of the people（）for the survey were female.

A.were questioned
B.who questioned
C.who were questioned
D.question

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