單項(xiàng)選擇題They decided to () into the cause of the accident.

A.see
B.look
C.watch


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1.單項(xiàng)選擇題This is one of the most important things () all.

A.among
B.in
C.of

2.單項(xiàng)選擇題Tom is a person who always () up to dangers.

A.meets
B.faces
C.sees

3.單項(xiàng)選擇題He worked in this company () several years.

A.in
B.since
C.for

4.單項(xiàng)選擇題The ()of employees in this company has doubled.

A.sum
B.amount
C.number

5.單項(xiàng)選擇題The Europeans ()to stay ahead in aeroplane design.

A.failed
B.missed
C.lost