EXERCISE 3I. CHỌN TỪ/ CỤM TỪ THÍCH HỢP (ỨNG VỚI A, B, C, D) ĐỂ HÒAN TH...

49. You must do it now, or never.

A. If you don

^’

t do it now, you

^’

ll never do it. B. Do it now, and then never again.

C. You

^’

ll never do it again if you do it now. D. If you don

^’

t do it now, you can do it later.