基本語法。
1. I haven't heard from him ______ he went to America.
2. He won't be here______he is invited.
3. He will not go to the cinema ______he is very busy.
4. We found the key ______she had left it.
5. We found the books two days ______he had gone away.
1. since   2. unless   3. because   4. where   5. after
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