【题目】street crossing he is the comes a car but (.) （连词成句）
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【答案】He is crossing the street, but a car comes.
【解析】
the street街道，crossing穿过，he他，is是，comes过，a car一辆车，but但是，根据所给的句号，可知句子是一个陈述句，根据所给词义可以连成句子：他正在过马路，但是来了一辆车。故答案为He is crossing the street, but a car comes.