托福文法結構選擇題 請高手幫忙

Question

__________ in his grand operas, Rinsky-Korsakov six times dealt with fantastic and but twice with real or historical subjects.

1. Which of that will observe
2. It will be observed that
3. When will it be observed
4. Observing that when



能否請各位高手替我解答, 回答時請附詳解, 讓我知道其他三個選項錯誤的地方在哪裡 謝謝

謝謝dany的回答 但是請問一下第四個選項 動名詞不是可以當主詞來用嗎? 為什麼這裡不行用呢? 謝謝

Answer 1

不看最前面的空格, 您可以發現後面整段自成一個完整的句子, 所以必然需要一個連接詞來與另外一個句子結合.
與之連接的句子必然也需要自己的主詞與動詞.
1. 與 3. 的疑問句型可以先排除.
4. 缺乏動詞, 不成句子. 也無法構成分詞片語.
e.g. :
Observing that when in summer, John likes to go biking, I bought a new bike for him yesterday.
整句的型態是
It will be observed that + 名詞子句.
it 稱為"虛主詞", 代表後面的名詞子句.

Answer 2

The ansewr is 2

It will be observed that when in his grand operas, Rinsky-Korsakov six times dealt with fantastic and but twice with real or historical subjects.

1. not a question form this sentence
3. not a question form this sentence
4. without a subject