If you don't know ____________ a problem,don’t be sad.Just think it over.If you don't know ____________ a problem,don’t besad.Just think it over.A.how to do with B.how to do C.what to do with D.what to do请问：C与D有何区别?为何不选B?a

What if I don't know anyone?同义句What __ __ __ if I don't know anyone If You Don T Know 歌词 if you don't know a word ,you can __ it __ in a dictionary .A.look ; for B.look ; up C.look after D.look ; like you never know if you don't try If you don't know what you want是什么句型? don't know if he __.If he__,I will tell you为什么A.will come ,comes B.will come ,will come C.comes,comes IF YOU DON‘T KNOW HOW TO SPEAK IN ENGLISN； You don't know even if I vanish from your Hao can i know ,if you don't say If you don't know the way,_______please咋填 I don't know __ he will come tomorrow.___he comes,I'll let you know.A.whether;if B.if;whether C.when;whether D.that;if请做答并解释,最好说一下相近词的区别和用法 “if you don't want others to know about it ,don't do it. It doesn't matter if you don't know him well.if引导的是什么从句 I don't know 同意句转I don't know.I __ __ __. “i don't know you know i don't know I don't know if he __(come) if it ___(rain) tomorrow.请问第二个空该怎么解释? I don't know if he __ to the movie this evening.If he wants,so ___ I. where is the railway station?I don't know.合并成一句 I don't know __ __ __ __ __.