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單項(xiàng)選擇題

No one knows who will call（）to solve the problem.

A.tune
B.tunes
C.the tune
D.a tune

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He was late（）the traffic jam.

A.as result
B.as a result of
C.as the result of
D.a result of

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