keep calm when problem come along用come还是came

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• keep calm when problem come along用come还是came
• keep calm when problem come along用come还是came
• 用since,as,when,as soon as,while,if,after,before,until或because 填空.1.He asked me another question ( ) I could answer the first one.2.I was doing my homework ( ) suddenly a dog came in.3.The students sang ( ) they went along.4.( ) I was writing letters last night,he was watching TV.5.I'll be more careful ( ) what you have said.6.Please wait here ( ) I come back.7.It is so dark outside ( ) it is raining.8.( ) everyone is here,let's begin our meeting.9.( )
• I can come
• come on 和 come in 的区别及用法