问题
选择题
| —Dad, I'm afraid that I can't do it. —Take it easy, dear. You'll never know it____you try. |
| [ ] |
| A.after B.since C.when D.until |
答案
答案：D
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| —Dad, I'm afraid that I can't do it. —Take it easy, dear. You'll never know it____you try. |
| [ ] |
| A.after B.since C.when D.until |
答案：D