Willian Henry is a young American professor who__(teach)in a chinese college for there years.
问题描述：
Willian Henry is a young American professor who__(teach)in a chinese college for there years.
答
have taught
答
has taught
for three years要用完成时
答
这里需要用到现在完成进行时：have been teaching现在完成进行时：（一）表示从过去某时开始一直持续到现在的动作,并且还将持续下去.（正是题目中的情况）I have been learning English since ten years ago.自从十...
答
has taught
看到for three years 就是已经完成了的事情
所以用完成时
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