问题
选择题
After half a year’s training, they were made entirely used ____ underwater.
A．stay
B．to stay
C．to staying
D．staying
答案
答案：C
考查短语搭配。be used to doing sth习惯于某事，这里是适应的意思。句意：经过多年的训练,他们已经完全适应在水下。
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