Question

Some little boys have difficulty ______their hearts into the lesson for a long time.

A．to put

B．to put

C．putting

D．puting

Answer 1

C

此題考查固定句型結(jié)構(gòu)have difficulty in doing sth表示做某事有困難，其中in可以省略。動詞put的現(xiàn)在分詞形式putting。故選C。