—We could invite John and Barbara to the Friday night party.
—Yes, ? I’ll give them a call right now.
A. why not
B. what for
C. why
D. what
网友回答
(答案→)A. why not
B. what for
C. why
D. what
解析：考查交际用语。why not，为什么不呢？是用疑问语气表达肯定含义，表示同意上文的意见；what for为何，为什么；why为什么；what什么。根据I’ll give them a call right now可知我同意上文的意见，所以选A。