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Gunpowder … a mixture of potassium nitrate, charcoal and sulfur.

Question 1:

Gunpowder … a mixture of potassium nitrate, charcoal and sulfur.

A. had

B. was

C. had been

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

Practice Quiz 32 | B2 – Upper-Intermediate

30 minutes
30 questions