They consider ____ the problem should be solved at once
问题描述：
They consider ____ the problem should be solved at once
A.it important that B.that it important C.important that D.important of it that
答
选择A.it做形式宾语,important是宾语补足语,that引导的一个句子是consider真正的宾语.意为“他们认为马上解决这个问题才是重要的.”但参考答案为D啊？