- Such a small mistake could have been avoided.- Yes. But I too nervous to see the zero.A. am B. hav

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【题目】--- Such a small mistake could have been avoided.

--- Yes. But I too nervous to see the zero.

A. am B. have been

C. was D. had been

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【答案】C

【解析】

考查时态。句意：——这样一个小错误本来是可以避免的。——是的。但是我太紧张了，看不到零点。由could have been avoided（本来可以避免）可知双方在谈论过去的事。故选C。