题文
A ship in harbor is safe, but that's not ______ ships are built for.
| A. | what | B. | whom | C. | why | D. | when |
推荐试卷
A ship in harbor is safe, but that's not ______ ships are built for.
| A. | what | B. | whom | C. | why | D. | when |
试题篮
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