【单选题】

Methods of studying vary; what works (21) for some students doesn’t work at all for others. The only thing you can do is experiment (22) you find a system that does work for you.But two things are sure: (23) else can do your studying for you, and unless you do find a system that works, you won’t go through college. Meantime, there are a few rules that (24) for everybody. The hint is "don’t get (25) ".

The problem of studying, (26) enough to start with, becomes almost (27) when you are trying to do (28) in one weekenD、 (29) the fastest readers have trouble (30) that.And ff you are behind in written work that must be (31) , the teacher who accepts it (32) late will probably not give you good credit. Perhaps he may not accept it (33) . Getting behind in one class because you are spending so much time on another is really no (34) . Feeling pretty virtuous about the seven hours you spend on chemistry won’t (35) one bit if the history teacher pops a quiz.And many freshmen do get into trouble by spending too much time on one class at the (36) of the others, either because they like one class much better or because they find it so much harder that they think, they should (37) all their time to it. (38) the reason, going the whole work for one class and neglecting the rest of them is a mistake, if you face this (39) , begin with the shortest and easiest (40) . Get them out of the way and then go to the more difficult, time consuming work.
A．good
B．easily
C．sufficiently
D．well