1、On hearing a great noise, Mike looked forward through the window _____ what happened outside the room.

　　A. to seeing　　B. to see　　C. seeing　　D. to have seen

　　2、You _____ be driven out of the school if you dare to cheat in the exam.

　　A. should　　B. would　　C. will　　D. shall

　　3、Everyone hopes that we can do something to make things better, so we can’t help _____ under the stress.

　　A. but working　　B. but to work　　C. work　　D. but work

　参考答案&解析：

　　1、B　look forward to doing sth. / sth. 表示“盼望做某事”，而look forward to do sth. 表示“向前看”，表目的(要做……)。故答案为B。

　　2、D　shall用于第二、三人称表示说话人的心愿；will表示主语的心愿。故答案为D。

　　3、D　can't help but do …相当于 have to do … 表示“不得不做某事”。故答案为D。