Choose the most suitable option to fill in the blank:
We must do something soon before it ______(be) too late.

Solution (By Examveda Team)

In the given sentence "We must do something soon before it is too late," the most suitable option to fill in the blank is "is."

The verb "is" is in the present tense and is used to express a general truth or a situation that exists in the present or near future. In this context, "is" indicates that the time when something needs to be done is approaching and it is still not too late to take action.

The other options do not use the correct verb form for the given sentence. Option A, "was," is in the past tense, which is not appropriate for expressing the urgency of the situation. Option B, "will be," is in the future tense, which does not fit the context of taking action before it is too late. Option D, "has been," uses the present perfect tense, which is not suitable for describing a future event or the urgency of the situation.

Therefore, the correct answer is "C. is."