be doing/to do,will be doing区别

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be doing/to do,will be doing区别
No one ___ the building without the permission of the police
A.is leaving
B.has left
C.is to leave
D.will be living

选C is leaving代表正在进行的事物,has left代表过去发生的事物,is to leave代表某一时间要发生的事物或者某一客观条件下的事物,will be living 代表在未来某一点确定将要发生的事物,显然句子意思是在“有警察允许”的条件下要发生的事物,所以选择C.

be doing/to do,will be doing区别 be going to,be doing,will do有什么区别区别be going to do/will do/will be doing/be to do be to do与will be doing will \be doing to do \be about to do \be to do的区别 be to do.be going to do.be doing.will do.有什么区别? be going to do/be doing/will do/be to do等的区别~ will be 和will be doing 和be going to do 三者区别. 将来时态的区别be going to;will do;be doing;be to do;be about to do be used to do 和doing区别 be doing 和will do 和be going to do 的区别 will,be going to do,be doing表将来