( )someone knocks at the door,you must not open it.

问题描述:

( )someone knocks at the door,you must not open it.
A.Whoever
B.Wherever
C.Whatever
D.Whenever
要有理由.

D
someone knocks at the door,这里主谓宾都全了,所以不能选AC ,根据句子意思,不管任何时候有人敲门,选D