摘要：27．After a year’s training, they were made entirely used under water. A. to stay B. to staying C. staying D. stay 28．Each underlined phrase, clicked, provides a drop down menu with a list of choices A. that B. which C. when D. where
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After a year’s training, they were made entirely used ______ under water.
A. to stay B. to staying C. staying D. stay