2015中考英语复习：常见词组（17）
161 It's a good idea for sb to do sth 对…… 来说是个好主意162 It's important to sb 对某人来说很重要 eg： It's important to me
163 It's time to do sth It's time for sth 到了该去做某事的时间
eg ： It's time to have class It's time for class 该去上课了
164 join = take part in 参加
165 just now 刚才
166 keep +sb /sth +adj /介词短语 让什么保持什么样？
167 keep out 不让 …… 进入
168 keep sb adj 让……保持…… eg： I want to keep my mother happy keep healthy 保持健康
169 key to +名词 表示：某物的钥匙或某题的答案
170 key to… anser to … key 可以是答题或钥匙
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