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 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
Xem đáp án
D là đáp án đúng
Lời giải:
has already been => have already been
Giải thích: động từ trên thuộc về chủ ngữ “inventions” số nhiều