【題目】—When did you start your math homework？

—One hour ago，but I________it yet．

A．didn’t finish

B．finished

C．have finished

D．haven’t finished

【答案】D

【解析】由yet可知，應(yīng)該用現(xiàn)在完成時，并且必須是否定句式，因此答案為D。

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