He is clever enough to know the _______ to the exercise.

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He is clever enough to know the _______ to the exercise.

He is clever enough to know the _______ to the exercise.
He is clever enough to know the _______ to the exercise.

He is clever enough to know the _______ to the exercise.
He is clever enough to know the _way__ to the exercise.

importance/necessity

He is clever enough to know the _answer_ to the exercise.

answer

the answer to the question那个问题的答案

同意前面的answer, importance虽然可以,但是informal,如果出题人要考importance应该会把介词给为of而不是to