【題目】You have to stay at home if your homework________ before five o'clock.

A. isn't finished B. will finish

C. finished D. wasn't finished

【答案】A

【解析】句意：如果你的家庭作業(yè)沒有在五點之前完成，你必須呆在家里。本句是if引導(dǎo)的條件狀語從句，主句用一般現(xiàn)在時，從句也應(yīng)用一般現(xiàn)在時態(tài)；主語homework與“finish”是被動關(guān)系，所以使用一般現(xiàn)在時態(tài)的被動句。is/am/are+動詞的過去分詞。finished是finish的過去式或過去分詞。故選：A。

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