,动词词组.及它们的过去式.（急）初2的动词词组,和过去式.

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• 英语中Lack的用法请问lack,a lack of,be lacking in这3个词有什么区别.我知道lack可以做动词和名词.a lack of是个名词词组,并且a可以省略.be lacking in是动词短语.它们3个的用法到底该怎么用.比如:1;Those old people___a general understanding of the present situation.A:lack of B:are lacking ofC:lack D:in lack of就这道题而言,我认为AC都可以的.2:The couple died because of___oxygen when bathing.A:lack B:a lackC:a lack of D:a lack for我也觉得AC都可以.怎么回事呢.希望英语好的可以尽快回答我.3:Though___money,hie motehr managed to send him to universityA:lacked B:lacki
• ,动词词组.及它们的过去式.（急）初2的动词词组,和过去式.
• ,动词词组.及它们的过去式.（急）
• 有几个英语时态的选择搞不懂,1.An unexpected heavy rain caused severe flooding,and the water_____all the time.A.rose B.raised C.was rising D.was raising（为什么选D不能选C）2.--What are you doing under the table?--I____to find my watch.A.tried B.try C.am trying D.have tried(为什么选D不能选C)3.I will ask her for the book now,for she_____plenty of time to read since I lent it to her.A.has B.has had C.had had D.was having(为什么选B不能选C）4.We are late.I expect the film will already have star
• 请教高手already可以用于哪些时态请教大家already可以用于哪些时态？是不是完成时，过去时，现在时都可以使用？