题干
— Where are Jim and Tom? Their mother is looking for them.
— They _____ over there.
A：run
B：runs
C：are running
D：running
答案(点此获取答案解析）
C
— Where are Jim and Tom? Their mother is looking for them.
— They _____ over there.
A：run
B：runs
C：are running
D：running
上的函数
满足
且
时，
，则
（ ）