— What are the _______ doing there?
— They are busy _______ their science experiment.
A．Boys students; to doB．Boy students; to do
C．Boys students; doingD．Boy students; doing
D
考查名詞復(fù)數(shù)和非謂語動詞的用法。男學生的復(fù)數(shù)表示為boy students，固定結(jié)構(gòu)“be busy doing sth”忙于做某事。
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