题目内容
He knew that cholera would never be controlled _____ its cause was found.
| A.till | B.still | C.until | D.kill |
C
考查:not/never …until,直到……才, 句意:他知道霍乱将永远不会被控制,直到它的起因被找到。故选C。
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| A.till | B.still | C.until | D.kill |