The students pretended_______ attentively when the teacher came in.
A．to learnB．learningC．a(chǎn)nd learned D．to be learning
D
考察不定式的進行時,pretend to be doing,假裝正在做什么,句子的意思是學生們在老師進來的時候假裝正在認真學習，故選擇D
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