单项选择 People _____ always be careful with fire,or it can be dangerous.A.can B.needn't C.must D.shouldn't
问题描述：
单项选择 People _____ always be careful with fire,or it can be dangerous.A.can B.needn't C.must D.shouldn't
答
C
人们一定总是要注意用火,否则它可能是危险的
如果有什么疑问,如果回答有所帮助,