If people breath contaminated air they have breathing problems

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Choose the letter A, B, C or D to complete the sentences with given words

If/ people/ breath/ contaminate/ air, they/ have/ breathing problems.

If people breathed contaminated air, they had breathing problems.

If people breathed contaminated air, they would have breathing problems.

If people breath contaminated air, they have breathing problems.

If people breath contaminated air, they will have breathing problems.

Giải thích

Đáp án D

Giải thích: câu điều kiện loại 1 “If + S V(s/es), S will V”

Dịch: Nếu mọi người hít thở không khí ô nhiễm, họ sẽ có vấn đề về hô hấp.