二元一次方程组
的解是( )。
参考答案：B
解析： 本题有两种解法：一种是解方程组，求出其解；另一种是将被选答案代入方程组，逐个验证。
根据句意，用所给动词的适当形式填空。
1. —Who will be the host of the party?
—As far as I know, Linda has already _____ (choose).
2. I'm sorry _____ (keep) you _____ (wait) for so long.
3. Who would you like _____ _____ (thank) for your achievements?
4. He thought they _____ (not see) each other again.
5. Thank you very much for _____ (help) me with my English.
登记要件主义
的解是( )。 
的解是( )。 
_____ (thank) for your achievements?