After Jack had sent some e-mails, he _______ working on his project.
A．had started B．has started
C．started D．starts
C
考查動詞時態(tài)。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。句意：Jack發(fā)了幾份電子郵件之后，他才開始研究他的項(xiàng)目。
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