专四
单选题正确答案是（ ）
A． let
B． permitted
C． guaranteed
D． ensured
参考答案：B进入在线模考
动词辨析题。句意为:玻璃酒瓶和密封性良好的瓶塞使得葡萄酒存放的时间延长。一般情况下guarantee后可以加that引导的宾语从句，或guarantee sth．to sb．“向某人保证某事”，guarantee for sth．“为某事担保”；ensure sth．“保证某事”，ensure后可以加that引导的宾语从句，ensure sb．sth．“向某人保证某事”；letsb．/sth．do sth．“让某人/某物做某事”，因此let，guaranteed，ensured均不符合原句结构，排除。permittedsb．/sth．todo sth．，表示“使得……”，符合句意，故为答案。
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