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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.

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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.

By the turn of

that

were to

has already been

Giải thích

Chọn đáp án Dhas already been => have already been
Giải thích: động từ trên thuộc về chủ ngữ “inventions” số nhiều