题目内容
动词时态填空：
They ________ ________ (play) basketball when I saw them.
动词时态填空
My uncle ________(work)at the computer when I came in．
They ________(learn)about two thousand English words since they came to college．
动词时态填空:
They ________ ________ (play) football this time yesterday.
They ________ （learn） about two thousand English words since they came to college.
