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單項(xiàng)選擇題One day while Mr. King was working, he had a(an)（）and his left leg was badly injured.

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

1.單項(xiàng)選擇題It is assumed that students at an intermediate level will have a good（）of the basic structures and vocabulary of English.

A.command
B.commanding
C.to command
D.commanded

2.單項(xiàng)選擇題I am pleased to take（）to exchange views with you.

A.this opportunity
B.a chance
C.this time
D.aperiod

3.單項(xiàng)選擇題Please leave the key under the door（）you go out.

A.in case
B.in the case
C.in case of
D.in the case of

4.單項(xiàng)選擇題We have kept（）our friendship by writing to each other, so we are true friends.

A.back
B.up
C.off
D.down

5.單項(xiàng)選擇題It（）that I met one of my old classmates on my way home yesterday.

A.took place
B.occurred
C.broke out
D.happened