单项选择题20()
A. even if B. on condition that C. in case D. in time
单项选择题19()
A.extra B.useful C.special D.excellent
单项选择题18()
A.displease B.surprise C.cheat D.worry
单项选择题17()
A.ran B.escaped C.drove D.went
单项选择题16()
A.as B.after C.until D.while