请问must be dissolved in the soil solution做句子的什么成分,句子在下面,The mineral elements from the soil that are usable by the plant must be dissolved in the soil solution before they can be taken into the root.

请问must be dissolved in the soil solution做句子的什么成分,句子在下面,The mineral elements from the soil that are usable by the plant must be dissolved in the soil solution before they can be taken into the root. built dissolved must be what must be must be! must be going请问这句话是什么时态的? 请问it must be 后面接什么呀 请问must be和must在用法上有什么不同【举五个例子】 请问高手Material must be AZO DYE free and should comply to REACH standardMaterial must be AZO DYE free must be happy must be young must be beautiful Everyone must be present at the meeting.情态动词后要用动词原形,所以是must be Everyone must be present at the meeting.情态动词后要用动词原形,所以是must be请问present 这里是形容词吗? Hurry up!Jane__for us at the bus stop.A.must wait B.must be waitingC.can be waited D.must have waited 请问选哪个为什么? 请问must be off ,see 请问这句话是什么意思,以及是一种什么语气. sat ii 前半句：a salt dissolved in an organic ssat ii 前半句：a salt dissolved in an organic solvent will be a good electrical conductor后半句：Salts will not dissolve appreciably in an organic solvent Come here .过来.=You must come here .你必须过来.请问什么时候must后面加be,什么时候不加? ‘Darling,it must be terrible to be grown up '请问：grown up前面为什么有个be, must be 同义词 must be后面是动原吗 must be后面是动原吗