宇宏健康花城房价:选什么：____you should have no trouble with the difficult work.

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(A)Knowing this(B)If you're knowing this(C)From knowing this (D)If you had known this

A,主要是ing的用法

选d，这是虚拟语气。翻译是：如果那以前知道这个，那么你做这个事就不会那么难了。
如果选A是独立主格，后面时态不对.
选B的话时态不对，这是过去时的虚拟语气

选什么：____you should have no trouble with the difficult work. 20,____you do this experiment,the first thing you should consider is safety. 请问 WOULD 和SHOULD 代表什么意思？ ought to和should有什么区别？ You should be more study English和You should more study English有什么区别??? You should be more study English和You should more study English有什么区别?? You Should Love She跟You Should Love sher有什么区别吗？ H是指什么？ H&M...?什么呢..? go and get your coat .it's ____you left it.A.there.b.where选哪个，为什么。要绝对准确！