问题补充：
– Do you know this time yesterday?
-- Sorry, I don’t know.
A. what she is doing B. what was she doing C. what she was doing
答案：
解析：此题主要考查宾语从句，宾语从句要求用陈述语序，从yesterday可知用过去时，B. what was she doing是疑问句序，所以选C.
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