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第29页

信息发布者：

before we have the Internet

when/while he was playing football yesterday

after you pass your driving test

when it suddenly began to rain

when/while she is cooking

before you hand it in to your teacher

after she went to study in the UK

when they are very tired

till/until

since

since

till/until

since

till/until

till/until

since

√

till/until

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