If she attended the lesson yesterday, she could understand it now. If yesterday

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Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

If (A) she attended the lesson yesterday,(B) she could (C) understand it now.(D)

yesterday

could

now

Giải thích

Đáp án A. → had

Cấu trúc đảo ngữ với câu điều kiện hỗn hợp 3-2:

Had + S + (not) PP_II, S + would/ could/ might + V

Ex: Had I not told her about this, she wouldn't be sad now: Nếu tôi không nói với cô ấy về điều này, bây giờ cô ấy đã không buồn.