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Field trips are () funa.lot b.a lot of c.lot of

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Field trips are () fun
a.lot b.a lot of c.lot of
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为你解答.
Field trips are (b.a lot of) fun.
郊游很有乐趣.
解释:fun是名词,要用a lot of或lots of来修饰,这里只有B项是完全符合的.A和C都不完整.