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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1.單項(xiàng)選擇題Would you mind（）us how old you are?
A.tell
B.to tell
C.telling
D.to telling
2.單項(xiàng)選擇題50% of the people（）for the survey were female.
A.were questioned
B.who questioned
C.who were questioned
D.question
