_____ anyone come to see me ,tell him or her to wait outside.A if B should C were D had

问题描述:

_____ anyone come to see me ,tell him or her to wait outside.A if B should C were D had

A.if

A,if如果。

B
这个事虚拟语气的考点
should提前表示假设
具体可以网络搜索一下

A