【題目】Sheldon could have defeated Howard in the match, but he _______ too careless at the last minute.

A. is B. was

C. has been D. had been

【答案】B

【解析】句意：Sheldon本可以在比賽中打敗 Howard的，但是他最后一分鐘太粗心了。前面的could have defeated是對過去情況的虛擬，but后面的內(nèi)容是過去的事實，用一般過去式，所以選B。

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