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If the oxygen supply in the atmosphere … replenished by plants, we would die.

Question 1:

If the oxygen supply in the atmosphere … replenished by plants, we would die.

A. wasn’t

B. weren’t

C. hadn’t been

These questions are from this test. Would you like to take a practice test?

Practice Quiz 29 | B2 – Upper-Intermediate

30 minutes
30 questions