问题补充:
(·江西九江二模)If you won do as I tell you, you get the chance to be promoted because the competition is just too fierce.
A. couldn
B. mustn
C. shouldn
D. shan
答案:
A. couldn
B. mustn
C. shouldn
(答案→)D. shan
解析:选D考查情态动词。句意:如果你不照我说的做,你就得不到晋升的机会,因为竞争太激烈了。shall用于第二、三人称可表示说话人给对方的警告,符合句意。