come along
(a) arrive; appear 到达; 出现
When the right opportunity comes along, she'll take it. 待适当的机会来临, 她就能抓住.
`Is she married?' `No. She says she's waiting for the right man to come along.' `她结婚了吗?'`没有. 她说她在等待著意中人的出现.
(b) = come on d.
(c) = come on e.