书名：笛藤新Toeic必考单字600
版本：5/e
页数：p.199 第十四题
题目：
____ as it does, I don't understand how anyone can depend on that
country's market to provide a safe investment.
(A) Fluctuated
(B) Fluctuating
(C) Fluctuation
(D) Fluctuate
疑问：这题的答案为(B) Fluctuating,虽然写对了但是感觉怪怪的。看到题目时觉得
应该是用分词构句来开头。但是后句的主词是 I ,应该不是fluctuating的主词
而且前句又有一个as it does,想请问各位此题中fluctuating的主词是什么呢?
另外想请教在L30 p195中有一个例句如下:
No one is very comfortable investing in real estate while property
prices are fluctuating so much.
此句中comfortable后面接了investing ... so much，想请问为什么会出现V-ing呢?
investing ... so much感觉不像是当名词子句用，这句用来修饰什么呢?