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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1.單項(xiàng)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

2.單項(xiàng)選擇題Before she left on the trip, she() hard.

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

3.單項(xiàng)選擇題You()to lock the door at night.

A.should 
B.ought
C.must 
D.shall

4.單項(xiàng)選擇題-- Hello, could I speak to Don please? --()

A.Who are you 
B.What’s the problem
C.Are you Jane 
D.Who’s speaking?

5.單項(xiàng)選擇題It is very convenient()here.

A.living
B.live 
C.lived
D.to live