选哪个,请给出原因A.was she able to B.she was able to C.she has been able to D.has she been able to

选哪个,请给出原因A.was she able to B.she was able to C.she has been able to D.has she been able to

题目
选哪个,请给出原因A.was she able to B.she was able to C.she has been able to D.has she been able to
Mary had to work at evenings and weekends.Only in this way______complete the reports by the deadline.
答案
a这是标准的倒装句
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
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
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