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问题: can you imagine the difficulty I had________these

can you imagine the difficulty I had________these problems?
A settled
B to settle
C settling
D settle

解答:

the difficulty I had在句中做状语,可以省略不看,或提到句末,而剩下的imagine,imagine后面是要接名词或名词性的单词
     即
imagine+doing/n.
所以就选C