You will fall behind others you work hard.A. untilB. whenC. afterD. unless

问题补充：

You will fall behind others you work hard.

A. until

B. when

C. after

D. unless

答案：

A. until

B. when

C. after

(答案→)D. unless

解析：句意：你将会落在其他人之后，除非你努力学习。Until直到；when当……时；after在……之后；unless除非。结合句意只能选D。