Directions: Read each sentence to find out whether there is any grammatical error in it. The error, if any will be in one part of the sentence. The letter of that part is the answer.
She is not as smart as I think at first.

Options

A. A) as smart as
B. B) I think
C. C) at first
D. D) She is not

Answer

B

Explanation

.At first. means at the beginning, which means in the earlier time or past tense. So, .I thought (past form of think) is grammatically answer.