This key ___ be Peter's.His is still in the lock.
因为肯定的语气用must,否定要用can't ,而不能用mustn't
How was the weather yesterday? How was the weather=What was the weather like...
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I was deeply impressed by ... I was deeply mooved by. .impressed me greatly. ...gave me deep thoughts....
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C see a good deal of each other/see a lot of each other互相见面机会很多 A what to do ,what 做do的宾语,即to do what,用how 的话,要改为how to do it,否则缺宾语,句子不完整.that完全错...
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