A waitress served us. She was very impolite and impatient. A waitress, who served us

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A waitress served us. She was very impolite and impatient.

A waitress, who served us, was very impolite and impatient

A waitress, which served us, was very impolite and impatient

A waitress who served us was very impolite and impatient

A waitress whom served us, was very impolite and impatient

Giải thích

Chọn A

B. Sai vì which k thay thế từ chỉ người

C. Sai vì “a waitress” đã xác định

D. Sai vì whom không thay thế từ ở vị trí chủ ngữ