题目

Last night I went to bed early but couldn't ___ . A. get to sleep   B. get sleep       C. fall asleep    D. fall to sleep 答案：C选词填空。    解决  解答  解释1．这是个误会，我一定要(      )清楚这件事。2．怎样才能(      )这个难题呢？3．我想了很久，终于(      )出这道题。