题干
In order to enter the PE exam, now we spend at _____ least half _____hour a day at school.
A：a; an
B：the; a
C：不填; an
D：不填; a
答案(点此获取答案解析）
C
In order to enter the PE exam, now we spend at _____ least half _____hour a day at school.
A：a; an
B：the; a
C：不填; an
D：不填; a
