單項選擇題

The big man has always been eating on the go,（）he has got stomachache.

A.so
B.however
C.as
D.because

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單項選擇題

Great changes （） in China since 1978.

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

單項選擇題

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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