The production of different kinds of artificial materials ____________ essential to the conservation of our natural resources.
A. is
B. have been
C. are
D. were
Giải bởi Vietjack
Đáp án A
Chủ ngữ trong câu này là The production (đây là danh từ ko đếm được) => được chia động từ to be như danh từ số ít => B, C và D loại
Đáp án là A
Dịch câu:
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