题目内容
14、After half a year’s training , they were made entirely used underwater .
A．stay B．to stay C．to staying D．staying
试题答案
14、C
解析：过去分词短语used to这里为“习惯于……”用作补助语，to为介词。
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After half a year’s training , they were made entirely used underwater .
A．stay B．to stay C．to staying D．staying
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