1.The trees we have planted _____10,000.

1.The trees we have planted _____10,000.
A.add up B.add up to
答案为A为什么不是B?
2.Because of my poor English I’m afraid I can’t make myself（C ）.
A.understand B.be understood C.understood D.understanding
这句话是不是说“我不能让自己被别人理解”?但是理解成“我不能理解”不可以吗?
3.---Thank you ever so much for the book you sent me.
---_B____
A.No thanks B.I’m glad you like it C.Please don’t say so
C不可以吗
4..There are many good stories about the Long March,_A__this is the most instructive.
A.of which B.in which C.from which
C用于什么情况?
5.In order not to be disturbed,I spent three hours_B___in my study.
A.locking B.locked
6.Cars do cause us some health problems—in fact far more serious ones than mobile phones do.
请问破折号后面的句子是什么用法?
7.This is such a difficult problem _B_ nobody around can answer.
A.that B.as
答案为什么不选A,理解为“如此以至于”不可以吗?
8.---Which of the three ways shall i take to the village?
---__B___way as you please.
A Each B Any
请问A为什么不可以？