The lady listened carefully to my complaint but I doubt she will do anything about it.

Options

A. but I doubt she
B. will do anything about it
C. to my complaint
D. The lady listened carefully

Answer

A

Explanation

The given sentence is in the past tense so it will have a verb in its past simple form(doubted) and not in the present form(doubt). Hence, but I doubted she will be answer.