_____you understand this rule ，you‘ll have no difficulty in dealing with such problems.
D
once意思是“一旦”。while“当⋯⋯时候”;though“虽然”;unless“除非”。“一旦你明白了这个规则，处理类似的问题就不困难了。”显然，d符合句子意思的表达需要。
_____youunderstandthisrule，you‘llhavenodifficultyindealingwithsuchproblems.
He ________ me that he decided to leave on Monday.
After so many days without rain, the ground quickly ________ the little rain that fell last night.
网状结构除存在于丘脑，主要位于
The boy ran out of the classroom without the teacher's _______.
She ________ her nervousness to the importance of the interview.
When he suddenly ________ up the subject of genetic engineering, there was an embarrassedsilence.
The opposition leaders ________ the government for not taking action sooner.
党的过渡时期总路线所指的过渡时期是 _________。
1953 年，为解决粮食供应紧张问题，我国采取的新措施是 ()
The TV station, in ________ to massive popular demand, decided to continue the soap opera(肥皂剧 ).