單項(xiàng)選擇題We are（）how an error like this could have happened.

A.searching
B.researching
C.surveying
D.investigating


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你可能感興趣的試題

1.單項(xiàng)選擇題After two（）delay, our train arrived at last.

A.hours frustrating
B.hours frustrated
C.hours’ frustrating
D.hours’f rustrated

2.單項(xiàng)選擇題The football match was called（）because of the snow

A.off
B.up
C.for
D.in

3.單項(xiàng)選擇題My car（）

A.needs towash
B.needs wash
C.needs washing
D.needs being washed

4.單項(xiàng)選擇題The screen of my computer went（）suddenly.

A.back
B.blank
C.empty
D.nothing

5.單項(xiàng)選擇題We have had a new computer system（）

A.install
B.installed
C.installing
D.to install