Question

Fill in the blank with a suitable option:
I'll study the English language _______ I speak fluently. [Advanced]

• A. if
• B. after
• C. until
• D. while

Answer 1

The correct option is C until

Answer : C

Let us first understand what the words in options mean:

• if : It is used to express an opinion / surprise / regret or make a polite request
• after : It refers to a time following something / some event
• until : It means up to some specific point in time
• while : It means "at the same time"

Reading the sentence in the question, we understand that the speaker is expressing that he/she would study the English language to the point that he/she can speak fluently. The other words do not fit in correctly and do NOT make sense.

Therefore, the most suitable word here is "until".

Thus, the correct complete sentence is:

I'll study the English language UNTIL I speak fluently.