搜题
王老师:19139051760(拨打)
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第1题

on doing sth是做某事。
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第2题

efforts were made是努力。
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第3题

The new launch date is very tight. Tight. here means not leaving enough time A.对
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第4题

lf you are stuck ， change to a new point,To be stuck’ means to be sure of something
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