Study hard,__ you'll catch up with your classmates.

问题描述:

Study hard,__ you'll catch up with your classmates.
A.or B.so C.while D.and

D. and
固定结构:祈使句+and+将来时态的陈述句,相当于“如果.,那么(就会).”
这句的意思是:如果你努力学习,你就能赶上班里的同学.