基本信息
1) If places ______ alike, there would be little need for geographers.
A. being B. are C. be D. were
2) If I _____ the meaning of the word, I wouldn''t have to look it up.
A. know B. knew C. known D. knowing
与现在事实相反的假设
a)If I were in your position, I would accept their offer.
a) 如果我处于你的位置，我就接受他们的建议。
