题目

“Isn’t it about time you _____ to do morning exercises？” “Yes, it is. Would you like to join us？”     A. begin                            B. have begun     C. began                            D. had begun 答案：C 解析: 选C.It’s time… / It’s high time… / It’s about time… 等后接从句时，从句谓语通常用过去式。

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