The correct answer is: C. must have
The sentence “The roads are wet; it must had rained last night” is grammatically incorrect. The correct sentence should be “The roads are wet; it must have rained last night.”
The verb “must” is used to express certainty or obligation. In this case, the speaker is certain that it rained last night because the roads are wet.
The verb “have” is used to form the perfect tenses. In this case, the perfect tense is used to express a past action that has a result in the present. In this case, the result is that the roads are wet.
The past participle of the verb “rain” is “rained.”
Therefore, the correct sentence is “The roads are wet; it must have rained last night.”
The other options are incorrect for the following reasons:
- Option A: “might had” is not a grammatically correct construction. The correct construction would be “might have.”
- Option B: “must have been” is not a grammatically correct construction. The correct construction would be “must have.”
- Option D: “would have” is used to express a possibility or a hypothetical situation. In this case, the speaker is not expressing a possibility or a hypothetical situation, but rather a certainty.
- Option E: “No correction required” is incorrect because the sentence is grammatically incorrect.