2000 câu trắc nghiệm tổng hợp Tiếng Anh 2025 có đáp án (Phần 19)
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it is important ..(9)... we increase our efforts to find a ..(10).... source of energy as quickly as possible, so that we can avoid further environmental damage.

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 it is important ..(9)... we increase our efforts to find a ..(10).... source of energy as quickly as possible, so that we can avoid further environmental damage.

that

which

if

whether

Giải thích

C. if

giả định thức: It is + important/... + that