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By the turn of that were to has already been

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By the turn of the century, most of the inventions that were to bring in all the comforts of modern living has already been thought of. 

(A) By the turn of

(B) That

(C) Were to

(D) Has already been

Giải thích

Đáp án D => have already been

động từ trên thuộc về chủ ngữ “inventions” số nhiều