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_____youunderstandthisrule，you‘llhavenodifficultyindealingwithsuchproblems.
D
once 意思是 “一旦 ”。while “ 當(dāng)?? 時候 ” ;though“雖然”;unless “除非 ” 。“一旦 你明白了這個規(guī)則，處理類似的問題就不困難了。 ”顯然， d 符合句子意思的表達需要。
Thedriverpulled_____atthetrafficlights.
I will do the clearing if you see_____the lunch.
He‘s working hard_____.
Your bike needs_____.You ‘d better do i right now.
It was not until she had finished all her work_____.
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