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用since或for填空.

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用since或for填空.
1、Mike has been sstudying english_he was six years old.
2、i have been watching you_tow minters.
3、i have been parcticing the piano_10:30.
用since或for填空.
1、Mike has been sstudying english_since he was six years old.
2、i have been watching you_for two minters.
3、i have been parcticing the piano_since 10:30.
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