题目内容
用since或for填空。
1．I've been playing the piano ________ 9:00.
2．Mary has been running ________ 20 minutes.
3．Sarah has been sleeping ________ 11:00.
4．Dave has been talking on the phone ________ five minutes.
5．Lucy has been studying Chinese ________ he was six years old.
答案：
解析：
解析：
|
since; for; since; for; since |
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