In the following questions, a part of the sentence is given in bold. Below are given alternatives to the bold part at (1), (2) and (3) which may improve the sentence. Choose the correct alternative. In case no improvement is needed your answer is (4).
Roads are wet, it must have rained last night.

Options

A. must had
B. might have been
C. must have been
D. No Improvement

Answer

D

Explanation

(4) No Improvement
must have-expresses an opinion about an earlier (Past) situation, based on evidence.
• Dinosaurs were very big, they must have eaten a lot