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單項(xiàng)選擇題

Great changes （） in China since 1978.

A.take the place
B.took the place of
C.have taken place
D.have been taken place

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Electricity （） by the Greeks a good many years ago.

A.was first found
B.was first discovered
C.has first been discovered
D.was seen first

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Before she left on the trip, she（） hard.

A.trained
B.has trained
C.would trained
D.had trained