【題目】After Jack ________ some e-mails, he started working on his report.

A. sends B. has sent C. had sent D. would sent

【答案】C

【解析】

試題分析：考查動詞的時態(tài)。句意：杰克發(fā)了幾份電子郵件后，開始做他的課題。狀語從句是過去完成時，開始做課題是過去發(fā)生的，才能構(gòu)成“過去的過去”的動作，所以選C

考點(diǎn) : 考查動詞的時態(tài)

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