2. 外语
  3. Every policeman and fireman ______ on the alert.

Every policeman and fireman ______ on the alert.

admin2013-01-03  55
问题 Every policeman and fireman ______ on the alert.
选项 A、have been
B、was
C、are
D、were
答案B
解析 当every修饰一个或几个名词作主语时，谓语动词要用单数形式。
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