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單項(xiàng)選擇題

One needs a good sense of（） to ride a bike.

A.level
B.skill
C.balance
D.ability

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單項(xiàng)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

單項(xiàng)選擇題

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

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