or If we don't prevent some students from surfing the Internet late at night,they won't do their homework on time,-----A.or rather B.or worse C.or so D.or more

or If we don't prevent some students from surfing the Internet late at night,they won't do their homework on time,-----A.or rather B.or worse C.or so D.or more
or
If we don't prevent some students from surfing the Internet late at night,they won't do their homework on time,-----
A.or rather B.or worse C.or so D.or more

or If we don't prevent some students from surfing the Internet late at night,they won't do their homework on time,-----A.or rather B.or worse C.or so D.or more
选B,表示“或更糟”
or more表示“或更多”,不合句意

now or then 是“时不时，有时”的意思，一般做时间状语；
而more or less是或多或少，一般指程度或数量