问题补充:
The problem justto be discussed at the class meeting tomorrow.
A. referred is
B. referred to being
C. referring to is
D. referred to is
答案:
@@A. referred is@@B. referred to being@@C. referring to is@@(答案)D. referred to is
解析:本题的关键在于理解句子结构: referred to 在句中作定语,修饰名词the problem,而谓语动词为is, to be discussed是它的表语,be to do表示将来的动作。