He has been ill for several weeks,so he has ______ in learning Maths.

问题描述:

He has been ill for several weeks,so he has ______ in learning Maths.

句子是说,他生病好几周了,所以他现在学数学有困难。
have trouble/difficulty in doing sth表示做什么有困难

He has been ill for several weeks, so he has _difficulty_____ in learning Maths.
他病了好几周,所以学习数学有困难。

trouble/difficulty...?
have trouble in doing sth

difficulty have difficulty in doing sth 做某事有困难

A many difficults difficult可数,trouble不可数

have "difficultity/ problem/ trouble" in "doing" sth
常见题型就是把引号部分挖空