懂英语的进
问题描述：
懂英语的进
他们在做这些数学难题时遇到了困难
They _____ _____ _____ ______the diffcult Maths problems.
肿么填,要用have trouble (in)
打少了一个空。应该是
他们在做这些数学难题时遇到了困难
They _____ _____ _____ _____ ______the diffcult Maths problems.
答
填 had trouble in solving (过去式）
保证准确率~打少了一个空。。。应该是他们在做这些数学难题时遇到了困难They _____ _______________ ______the diffcult Maths problems.填 had some trouble in solving