Every officer and every soldier _______ obey the rules.

Every officer and every soldier _______ obey the rules.
A、had to
B、have to
C、has to
D、must have to
【正确答案】：C
【题目解析】：本题考查主谓一致。主语前面有every修饰时，谓语动词一般用单数形式。句意：每个军官和士兵都必须遵守规则。