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doing

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为什么6. My sister met him at the Grand Theatre yesterday afternoon, so he _A__your lecture. A. couldn’t have attended B. needn’t have attended C. mustn’t have attended D. shouldn’t have attended 为什么14. He never did anything in the morning but ___A______ English. A. read B. reading C. to read D. to reading
doing
解题思路: 6.couldn’t不可能,needn’t不必, mustn’t千万别,不一定,shouldn’t 不应当 14.but 连接并列谓语,did是过去时,选项中只有 read 是过去时
解题过程:
6.据题意,只选 A.
12.据题意,选 A.
最终答案:略