this of course ------ our difficulities Aadded up to Badded up C added to Dincreased

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thisofcourse------ourdifficulitiesAaddeduptoBaddedupCaddedtoDincreasedthisofcourse------ourdifficuli

this of course ------ our difficulities Aadded up to Badded up C added to Dincreased
this of course ------ our difficulities Aadded up to Badded up C added to Dincreased

this of course ------ our difficulities Aadded up to Badded up C added to Dincreased
sth increases,增长的东西应该做主语,但这里difficulties是宾语,D不对;
根据add 的用法应该选C啊,这答案果断错了!