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____doesn't seem to have been any trouble in solving this pr

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____doesn't seem to have been any trouble in solving this problem
A It
B there
C that
D he
答案是b,我想问怎么解释这个选项.并请分析下为什么不选a
为什么是there be的句型呢?怎么看出来的呢?
这就是一个there be in sth的句型的变型
如果用it的话
后面必须有形式主语
改成it doesn't seem to have been anytrouble to solve this problem