In the United States Father’s Day is on third Sunday in June.A. aB. anC. theD. /

问题补充：

In the United States, Father’s Day is on third Sunday in June.

A. a

B. an

C. the

D. /

答案：

A. a

B. an

(答案→)C. the

D. /

解析：考查冠词。 序数词前需加定冠词the ，句意为在美国，父亲节在六月的第三个星期日。