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。 |