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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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單項選擇題

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

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

單項選擇題

You（）to lock the door at night.

A.should
B.ought
C.must
D.shall

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