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單項(xiàng)選擇題

On formal（）, people pay more attention to manners.

A.situations
B.cases
C.conditions
D.occasions

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單項(xiàng)選擇題

On average, a successful lawyer has to talk to several（）a day.

A.customers
B.supporters
C.guests
D.clients

單項(xiàng)選擇題

On（）side of the street there are some trees.

A.both
B.either
C.every
D.all

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