The parents suggested _____ in the hotel room but their kids were anxious to camp out during the trip.[ ]

A. sleep

B. to sleep

C. sleeping

D. having slept

我国地势总的特点是[ ]

A、西高东低，是 状分布

B、东高西低，是 状分布

C、西高东低，是阶梯状分布

D、东高西低，是阶梯状分布