5000 câu trắc nghiệm Tiếng Anh 9 có đáp án - Phần 27
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If energy_____ inexpensive and unlimited, many things in the world would be different.

15/20

If energy_____ inexpensive and unlimited, many things in the world would be different.

is

were

will be

would be

Giải thích

Chọn đáp án B