Question

Not only__to Beijing, but I've also climbed the Great Wall. A.I have been B. have I been 该选哪个？

Answer 1

B.这句话是以 not only 引导的倒装句，常用的短语结构一般为：not only A but also B。（also 可以省略），如果not only 引导的是句子，则紧跟not only 后面的成分要倒装，but also 后面的部分不倒装，即所谓的“前倒后不倒”。
如：
1.Not only did the dog bark at him, but （also） bit him.
这只狗不但对他吠叫，而且咬了他。
2.Not only do they rob you, they smash everything too.
他们不仅抢夺你的财物，还要把每样东西都捣毁。

Answer 2

B.否定词放句首，句子要半倒装。

Answer 3

A

Answer 4

B