One part of the sentence below is incorrect. Choose it.

"The reason why he failed is because he did not work hard."

Answer and explanation

Correct answer: D. is because

  1. Step 1: After 'the reason', 'that' is used instead of 'because', which would repeat the idea.
Answer
is because.
Why not the others: The other parts are correct as written.

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One part of the… | College English Test Band 4 (CET-4) - China