一道初四英语选择题
题目
一道初四英语选择题
Tom wanted to know__________ shanghai to see the World EXpo.
A.if they have gone to
B.if had they been to
C.if they had gone to
D.if have they been to
答案
C
宾语从句的语序是陈述句语序,排除B与D,另外主句是一般过去时,从句应用相应的过去时,再排除A
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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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