英语选择题——分析选项You can not imagine the difficulty they had___the problem.it isn't ____easy.A、to solve ,so B、solved,soC、solving,thatD、solved,that选C,that 表示的是什么?

英语选择题——分析选项You can not imagine the difficulty they had___the problem.it isn't ____easy.A、to solve ,so B、solved,soC、solving,thatD、solved,that选C,that 表示的是什么?
英语选择题——分析选项
You can not imagine the difficulty they had___the problem.it isn't ____easy.
A、to solve ,so
B、solved,so
C、solving,that
D、solved,that
选C,
that 表示的是什么?

英语选择题——分析选项You can not imagine the difficulty they had___the problem.it isn't ____easy.A、to solve ,so B、solved,soC、solving,thatD、solved,that选C,that 表示的是什么?
have difficulty in doing sth.(其中in可以省略).因为要用动词的ing形式,所以直接就排除ABD.that是那么,如此的意思