—Oh it’s too difficult for me the task in such a short time.—Cheer up! I am sure you can

问题补充：

—Oh, it’s too difficult for me the task in such a short time.

—Cheer up! I am sure you can.

A. finish

B. to finish

C. finished

D. finishing

答案：

A. finish

(答案→)B. to finish

C. finished

D. finishing

解析：句意:哦.在如此短的时间内完成这项任务,对于我来说太难了. 强调句式， It is adj for sb to do sth，做某事对某人来说怎么样。本句中it是形式主语，指代后面不定式内容做形式主语.结合语境可知选B.