题目内容：
回答(13)题 A．unless
B．because
C．while
D．if
参考答案：
答案解析：
单选题：回答(13)题
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回答(13)题 A．unless
B．because
C．while
D．if
回答(13)题 A．unless
B．because
C．while
D．if
回答(6)题
回答(6)题 A．focused B．concluded C．decided D．based
回答(10)题
回答(10)题 A．tum B．take C．call D．move
________be careful in making such experimentings．
________be careful in making such experimentings． A．Do B．Does C．Did D．Will
We don’t deny that your products are superior in quality to
We don’t deny that your products are superior in quality to________of Japanese
Good distance learning program have the following character
Good distance learning program have the following characteristic EXCEPT________