题目

It is obvious to the students _______ they should get well prepared for their future.A.which B.that C.whether D.as 答案：【答案】B【解析】考查主语从句。句意：学生们显然应该为他们的未来做好充分的准备。此句用it做形式主语指代主语从句“___they should get well prepared for their future”，引导词在主语从句中不做任何成分且无意义，所以用that引导。故选B项。我国每年总有有地方发生水旱灾害，因为（ ）A. 地形复杂 B. 海岸线漫长C. 纬度位置 D. 夏季风强弱变化