问题
I have been trying my best to study English ________ I want to have a chance to be a volunteer for the Beijing Olympics. [ ]
A:until
B: because
C: though
D: when
B: because
C: though
D: when
正确答案是：
同类题型
Have you seen Mr. Black these days, Jack? —-Yes, I met him when I ________ in the street yesterday.
Is the woman a teacher? —Yes. She teaches ________ English.
_______ are my brother and sister．
Would you like to play table tennis with us after school?–– _________.
____Do you mind if I open the windows? _____ ______ I feel a bit cold.