His trousers ____ too dirty. And this pair of trousers ___ too long for him. A is is B are are
题目
His trousers ____ too dirty. And this pair of trousers ___ too long for him. A is is B are are
C is are D are is
答案
答案：选D.His trousers _are_ too dirty.And this pair of trousers _is__ too long for him.解析：当单独用的时候,trousers代表的是复数概念,当前面有量词pair的时候,要根据pair的单复数来确定谓语动词的单复数,这...
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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