Answer:
A. The very idea of doing homework on a weekend would've made us depressed.
Explanation:
The grammar is correct in the sentence:
The very idea of doing homework on a weekend would've made us depressed.
Would've = contraction for would have
Explanation:
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1. I wonder why are deadly extreme sports more popular than ever?
2. I'm asking you who is the most determined person you know?
3. I'm curious to find out is it your first time to go mountain climbing?
4. The reason why I won't go hang gliding is because I'm afraid of heights.
5. I'm telling you be careful when you go skateboarding.
6. Do you know if there are more people trying rock climbing than ice climbing?
hope this helps!
D. In an encyclopedia under the word “dictionary”
Subject. The subject in a sentence is the thing being talked about and hence cannot be left out or else the sentence makes no sense.