UC知道另一道语法题
来源：百度知道 编辑：UC知道 时间：2024/06/16 23:29:58
The scientists and technicians overcame a lot of difficulty _______ the personal computer.
A. they have developing
B. having developing
C. they had developed
D. which has to develop
答案是A。 但是不懂，求助！！
A. they have developing
B. having developing
C. they had developed
D. which has to develop
答案是A。 但是不懂，求助！！
have difficulty doing something 是词组。这是定语从句，分开就是
1The scientists and technicians overcame a lot of difficulty
2THEY HAD DIFFICULTY DEVELOPING the personal computer.