What ____ you _____at this time yesterday?3QWhat ____ you _____at this time yesterday?A.did;do B.are;doing C.were;doing 为什么不选A,选C?

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What____you_____atthistimeyesterday?3QWhat____you_____atthistimeyesterday?A.did;doB.are;doingC.were;

What ____ you _____at this time yesterday?3QWhat ____ you _____at this time yesterday?A.did;do B.are;doing C.were;doing 为什么不选A,选C?
What ____ you _____at this time yesterday?3Q
What ____ you _____at this time yesterday?A.did;do B.are;doing C.were;doing 为什么不选A,选C?

What ____ you _____at this time yesterday?3QWhat ____ you _____at this time yesterday?A.did;do B.are;doing C.were;doing 为什么不选A,选C?
at 表示在这个时间点 正在做的