Choose the grammatically correct sentence.
Answer: D
Correct answer: He came in very quickly so that he might avoid waking his father.
So that introduces the purpose, and might is the correct past-referring modal after a past main verb.
Why the others fail:
- He came in too quickly to avoid waking his father - too… to means the result was not achieved, which reverses the sense.
- He entered in quickly - enter is transitive and takes no in.
- Having not to wake his father - not an English construction; the negative participle would be not having, and even then it would not express purpose.
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