单选题 To ensure ______ , the current employees will stay for 3 more weeks while the newly hired ones become fully available.
A. continual
B. continue
C. continuity
D. continuous

【正确答案】 C

【答案解析】初级问题空格内应填入名词。这里只有C选项是名词。请记住A选项和D选项这两个形容词：continue是既可以接to do也可以接doing做宾语的不及物动词。