Mary decided not to work on the program at home because she didn’t want her parents to know what she __________.
A．has doneB．had doneC．was doingD．is doing
C

試題分析：考查時態(tài)。句意：Mary決定不在家里做那個項目，因為她不想她的父母知道她正在做的事情。根據(jù)句子的decided說明本句的基本時態(tài)是過去時，根據(jù)句意說明是過去的那段時間正在做的事情，故使用過去進(jìn)行時。故C正確。
點(diǎn)評：時態(tài)題的考查要根據(jù)上下文的語境和語義的辨析，要抓住句子的關(guān)鍵詞。
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