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1.I have some difficult _______ what he said,because he coul

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1.I have some difficult _______ what he said,because he couldn't express himself clearly.
A.to understand B.understanding C.to know D.know
但不明白为什么选B啊,选A不行吗?为什么要加ing而不用to
打错了,应该是difficulty
1.I have some difficult _______ what he said,because he coul
B
have difficult (in) doing sth
in 常省略.表示“在做.上有困难”