【題目】After Jack had sent some e-mails, he _______ working on his project.
A.had started
B.has started
C.started
D.starts

【答案】C
【解析】句意:Jack發(fā)了幾份電子郵件之后,他才開(kāi)始研究他的項(xiàng)目。根據(jù)前半句的謂語(yǔ)動(dòng)詞用了過(guò)去完成時(shí),可知后半句用一般過(guò)去時(shí),這樣才能符合“過(guò)去的過(guò)去”這一條件。故選C。

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