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spends/in spent/on has spent/on had spent/in
she spent she spends did she spend had she spent
spend had spent have spent will spend
is spent has been spent was spent had been spent
28Si、29Si、30Si 是不同元素的三种原子 28Si、29Si、30Si 互称为同位素 28Si、29Si、30Si 分别含有14、15、16个质子 28Si、29Si、30Si都含有14个中子
were spent was spent has spent had spent
spent were spending had spent could spend
have been spent had spent were spent was spent
spend to spend spent had spent
that spent what has been it had been that was spent
have spent spent had spent am spending
had a rest spent had some nice food enjoyed themselves
was cost had cost having been spent having spent
has been spent had been spent having spent having been spent
have been spent had spent were spent was spent
spend had spent have spent will spend
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