问题补充：
She sings very well. She can the school music festival.
A. is in
B. is on
C. be in
D. be on
答案：
A. is in
B. is on
(答案→)C. be in
D. be on
解析：in在里面,从事于;on在上面,在进行中的;句意:她唱得非常好.她可以参加学校的音乐节.can后面动词用原形,结合语境可知选C.
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