1.(2013·全国Ⅰ，29)The door ________ open, no matter how hard she pushed.
A．shouldn't B．couldn't
C．wouldn't D．mightn't
答案：C 本题考查情态动词的用法。句意：不管她怎样用力推，门就是打不开。would情态动词(表示尽管付出很大努力却没有发生)就(不)，偏(不)，如：He kicked, pushed, and hurled his shoulder at the door. It wouldn't open.他冲着门又踢又推，还用肩膀撞，但门就是打不开。故C项正确。
2．(2013·江苏，30)I should not have laughed if I ________ you were serious.
A．thought B．would think
C．had thought D．have thought
答案：C 考查虚拟语气。句意：我本不应该笑的，如果想到你是严肃的。
