The problem just ______ to be discussed at the class meeting tomorrow.
A、
referred is
B、
referred to being
C、
referring to is
D、
referred to is
【正确答案】
D
【答案解析】
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。
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