有关非谓语动词..___again later if the webpage you are looking for is temporarily unavailable.A.Try B.To try C.Having tried D.Trying 后面有个is,句子已经有动词,那前面那个空为什么不用非谓语呢

问题描述:

有关非谓语动词.
.___again later if the webpage you are looking for is temporarily unavailable.A.Try B.To try C.Having tried D.Trying 后面有个is,句子已经有动词,那前面那个空为什么不用非谓语呢

这题是选A吗

祈使句…开头用动词原形

if the webpage(从句主语) you are looking for(定语从句,修饰webpage) is (系动词)temporarily unavailable(表语).这是if引导的条件从句
前半部分是句子的主干,因为没有主语,只能是祈使句,所以这里只能选A.