_________ the players tried their best to win the game for their country.
题目
_________ the players tried their best to win the game for their country.
A.Greatly encouraged B.Having greatly encouraged
C.To begreatly encouraged D.When encouraging
为什么选A
答案
Greatly encouraged 是过去分词,做状语和主语之间是被动关系.而B 和D 都是现在分词表示主动.C 虽然是被动但表示目地所以不用.
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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．
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