There are too many difficulties for us ___.A.to deal with B.to do with
A 、B 都对呀!此语境下,两者可互换.
句意：有那么多问题要我们处理.
deal with 处理；涉及；做生意
do with利用,处理；需要；忍受；与……相处
例如：The problem is difficult to deal with/ do with.
只是,【how】 to 【deal with】与【what】to 【do with】 不可互换.