问题
选择题
I had a lot of trouble______the book you wanted.
A．on finding
B．in finding
C．to find
D．at finding
答案
Ｂ
have trouble（in ）doing sth.干某事时碰到困难。
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I had a lot of trouble______the book you wanted.
A．on finding
B．in finding
C．to find
D．at finding
Ｂ
have trouble（in ）doing sth.干某事时碰到困难。