题目内容
---What are the _______ doing there?
---They are busy _______ their science experiment.
- A.Boys students; to do
- B.Boy students; to do
- C.Boys students; doing
- D.Boy students; doing
D
考查名词复数和非谓语动词的用法。男学生的复数表示为boy students,固定结构“be busy doing sth”忙于做某事。
考查名词复数和非谓语动词的用法。男学生的复数表示为boy students,固定结构“be busy doing sth”忙于做某事。
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