题目内容
从所给的四个选项中选择最佳答案
The father had great difficulty ______ his son to work out the maths problem
.[
]A
.to help B.in helpingC
.helped D.help
答案:B
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题目内容
从所给的四个选项中选择最佳答案
The father had great difficulty ______ his son to work out the maths problem
.[
]A
.to help B.in helpingC
.helped D.help