---Could I use your cellphone to make a call?
题目
---Could I use your cellphone to make a call?
---Sorry.it____in the office.
A is charging
B has charged
C is being charged
D has been charged
charge 及物吗?
答案
选C.
这里是现在进行时的被动语态
意为:不好意思,手机正在办公室(被)充电.
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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