a. |x| > x

=> x < 0

b. |x| > x

=> x là mọi số nguyên thuộc Z.

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

He wanted to know _________shopping during the previous morning.

A. if we had been going

B. that if we had been going

C. we were going

D. that we were going