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. My brother usually asked me for help whenever he h

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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.

My brother usually asked me for help whenever he has difficulty doing his homework.

for

has

doing his homework

My brother

Giải thích

Hòa hợp thì:

Mệnh đề chính chia thì QKĐ → mệnh đề trạng ngữ cũng chia thì QKD

Sửa: has → had

Tạm dịch: Em trai tôi thường nhờ tôi giúp đỡ bất cứ khi nào em gặp khó khăn khi làm bài tập về nhà.

→ Chọn đáp án B