祈使句表示警示与建议 — 英语选择题
题目
校园安全周活动中，同学们讨论如何提醒大家防范危险。下列句子中，属于用祈使句表示警示的一项是（ ）
A. You should not swim in the river alone.
B. Don't touch the broken wire! It's very dangerous.
C. We must keep away from the deep water.
D. It is dangerous to play with fire at home.