One of our engines has broken down,( ) there is no need to panic.
问题描述：
One of our engines has broken down,( ) there is no need to panic.
A so B but C and D or
答
One of our engines has broken down,( ) there is no need to panic.A so B but C and D or选择B.我们的其中一个引擎坏掉了,但是各位没有必要恐慌.but表转折.如果选A,句意不对：我们的一个引擎坏了,所以我们没必要...