The student’s ____ was to write a book report.
题目
The student’s ____ was to write a book report.
A.appointment
B.assignment
C.agreement
D.achievement
.When was the house
A.build
B.has built
C.built
D.has been built
His father ____since he lost his job three months ago.
A.had been unemployed
B.was unemployed
C.has been unemployed
D.has unemployed
答案
第一题是选择B的,题目是：这个学生的作业是写一份读书报告.
第二题嘛~选的是C,这题考的是时态
第三题选的是C,同样是考时态
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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