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两道英语题 谢谢了Ling Feng took care of Jim’s bird _______ he was aw

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两道英语题 谢谢了
Ling Feng took care of Jim’s bird _______ he was away.
A. during B. since C. before D. while
她保持健康的饮食,尽力避免增加体重.
She always eats healthily and ___________________________________________________.
1.D,while,表示当...这里就是当他不在的时候这段时间.
try to avoid putting on weight.
try to do sth.尽力做某事
avoding doing sth 避免做某事.
put on weight.增加体重,习语.
再问: 为什么A C D 不对?
再答: A,druing表“在此期间”。 后接短语,而这后面是句子。不对吧。 B,since一般用在完成时中。意思是自..... C,before,在...之前。语境不符。