-Why have you bought so much food ?----My good friends to stay with me for the weeken

问题补充：

---- Why have you bought so much food ?

----My good friends to stay with me for the weekend.

A. are coming

B. have come

C. come

D. will have come

答案：

(答案→)A. are coming

B. have come

C. come

D. will have come

解析：句意为：—你为什么买这么多吃的啊？---我的好朋友要来这儿和我呆一个周末。朋友要来，应是发生的将来的事情，故应为Ａ．have done 现在完成时表示已经来了，不符合题意；come一般现在时，表示经常性，习惯性，也不符合题意；will have come表示将来完成的动作，即在将来的某个时候完成的动作，题目中并不是到周末就来过的意思，是周末来，故排除。