题目内容
动词时态填空
They ________(learn)about two thousand English words since they came to college．
答案：have learned
解析：
解析：
|
“since”用于现在完成时． |
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题目内容
动词时态填空
They ________(learn)about two thousand English words since they came to college．
|
“since”用于现在完成时． |