8．After Jack had sent some e-mails，he _______ working on his project．（　　）
A．had startedB．has startedC．startedD．starts

分析 句意為：Jack發(fā)了幾份電子郵件之后，他才開始研究他的項目．

解答 答案：C
根據(jù)句中的兩個動作的時間先后和前句中的after判斷，start的動作應該是在send之后，send是"過去之過去"的動作，所以后面的動作應該用一般過去時．

點評 判斷兩個動作的先后，首先要根據(jù)連詞如after，before，by the time…等，然后根據(jù)句意進行判斷．

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