题干
After school, we usually play ______ basketball for half ______ hour on the playground.
A：the; /
B：the; the
C：/; an
D：/; a
答案(点此获取答案解析）
C
After school, we usually play ______ basketball for half ______ hour on the playground.
A：the; /
B：the; the
C：/; an
D：/; a
等于
