Question

Fill in the blank with the most appropriate conjunction.
___________ our friends are in trouble, we must help them.

• A. When
• B. As
• C. Than
• D. But

Answer 1

The correct option is A When

The word 'when' is a conjunction which means 'at the time that'. We know that we have to help our friends at the time that they are in trouble. Hence, this is the most appropriate conjunction to be used in the given blank. Hence, option A is the correct answer.

Option B: The conjunction 'as' is used to indicate that something happens during the time when something else is taking place. The two events joined by the conjunction 'as' should happen at the same time. We help our friends once we know (and immediately after we know) that they are in trouble; And not simultaneously when they are in trouble. Hence, this option is not the most appropriate.

Option C: The conjunction 'than' is used for introducing the second element in a comparison.

Option D: The conjunction 'but' is used to introduce a phrase or clause which contrasts something which has already been mentioned.

In the given sentence, we do not have two things or activities which are either compared or contrasted. Hence, options C and D are incorrect.