Answer:
A. The very idea of doing homework on a weekend would've made us depressed.
Explanation:
In answers C and D, the use of "idea've" does not exist. In answer B, "would of" is incorrect. Answer A includes the correct "would've" and the correct "idea" .
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
Electronic measurement tools accurately store a large volume of data very quickly.
B. The animals finally reach the berry bushes and begin eating
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