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單項選擇題

One day while Mr. King was working, he had a/an（）：his left leg was badly injured.

A.business
B.accident
C.matter
D.event

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One cannot learn a foreign language well（）he studies hard.

A.unless
B.if
C.as
D.when

單項選擇題

One and a half hour（）since we arrive. No one has come to meet us.

A.have passed
B.was passed
C.pass
D.has passed