题目内容
---Would you like to go hiking with us this Sunday?
---Sure, _______ I am busy.
- A.until
- B.when
- C.unless
- D.since
C
根据文章的意思,C符合题意。
根据文章的意思,C符合题意。
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题目内容
---Would you like to go hiking with us this Sunday?
---Sure, _______ I am busy.