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英语非谓语动词疑问1.You can imagine what great trouble they have ___

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英语非谓语动词疑问
1.You can imagine what great trouble they have ___ the problem being discussed.
A.to solve B.solved C.been solved D.solving
2.___ the program,they have to stay there for another two weeks.
A.Not completing B.Not completed C.Not having completed D.Having not completed
为什么选D、B啊,请各位大虾解释一下
have trouble doing sth是固定句式,该句是变了形的,意在迷惑你
第二句是答案错了,逗号前后主语一致,应该用Not completing
我高三的,请相信我!