问题描述：
英语语法题!hurry up!
we can't imagine what great difficulty they have ____the problems in the plan.
A.to settle B.settling C.settled D.to be settled
这一类的题目是关于什么方面的?并说一下语法理解
we can't imagine what great difficulty they have ____the problems in the plan.
A.to settle B.settling C.settled D.to be settled
这一类的题目是关于什么方面的?并说一下语法理解
问题解答：
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