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We are（）how an error like this could have happened.

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

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After two（）delay, our train arrived at last.

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

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The football match was called（）because of the snow

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

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