A ship in harbor is safe, but that’s not ______ ships are built for.
| A．what | B．whom | C．why | D．when |
相关试题
____________ you may be right, I can’t altogether agree.
| A．While | B．As | C．If | D．Since |
The emergency req
uired that all the tasks _____ at least two days ahead of time．
| A．to complete | B．should complete | C．be completed | D．should have been completed |
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