1.Singing and talking happily ,the students _____ by.

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1.Singing and talking happily ,the students _____ by.
A.passed B.past C.pass D.pasted (为什么不选B）
2.How _____ the horse ______
A.fast run B．slowly walks C.fastly is D.slow runs(为什么不选D）
3.Everything goes well,don't worry about your family ______ life.
A.or B.and C.themselves D.them (为什么）
4.What does he mean by _____ at us like that?
A.smell B.smiling C.smiles D.smile (为什么）
第二题没错．正确答案是A．B．A.B.但是为什么这么选

1：past是介词,这里要动词,而且pass by路过,经过,是固定搭配.
2：不选d是因为slow是形容词,这里意为“跑/走的慢”用来修饰run/walk这个动词只能用slowly这个副词.符合要求的只有b.
3：这个,我记得and不用于否定句中.否定句中用or.c和d应该没问题咯,意思都不对了.
4.：by是介词,后面不能跟动词,所以用动名词smiling

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