Question

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

• A. was
• B. will be
  
• C. is
• D. has been
  

Answer 1

Answer: (C)

is

"Be", means to take place, occur or exist, and 'is' is the singular third person form of 'be'. Hence, option C is the correct answer.

Option B is incorrect because it is in the future tense, while the statement is in the present tense.

Option A and D are incorrect because they are in the past tense while the statement is in the present tense.