问题补充：
There a conert at the theatre on Saturday evening.
A. be going
B. going
C. is going to be
D. is going to have
答案：
A. be going
B. going
(答案→)C. is going to be
D. is going to have
解析：句意：在星期六晚上在剧院将有一场音乐会。there be……表示存在，有。根据时间短语on Saturday evening.可知此处用一般将来时，故选C。
