题目内容

Susan decided not to work on the program at home because she didn’t want her parents to know what she______ .
A．has done B．was doingC．had done D．is doing
B
考查时态.句意:苏珊决定不在家做这个程序,因为他不想他的父母知道她正在做什么.可知从句内容描述的是过去正在进行的动作,用过去进行时,故选B.
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