【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,他才開始研究他的項目。根據(jù)前半句的謂語動詞用了過去完成時,可知后半句用一般過去時,這樣才能符合“過去的過去”這一條件。故選C。

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