1.( )A long strong stick _________ the earth just now.
题目
1.( )A long strong stick _________ the earth just now.
A.was knocked in B.was knocked into C.knocked in D.knocked into
2.( )Mary ________ some songs in her room in the morning.
A.heard sing B.heard to sing C.was heard sing D.is heard to sing
答案
1/ b
2 我觉得应该是 was heard singing 可是一个都没有
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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