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He it this morning.A. did was doing have done had done
join a party joined a party h
would win, had could have won, had would have won, has could win, has
is killed was killed has been killed had been killed
was being struck ,had hit has been struck,had hit has been struck ,has hit will be struck , has hit
died; had sat has died; has sat has died; is sitting died; has been sitting
1mol CH3COOK含有1mol钾元素 CH3COOK的摩尔质量为98g 1mol CH3COOK含有2mol氧 1mol CH3COOK约含有3×6.02×1023个H.
had has are having were having
could have won ,had would win, had would have won, has could win,has
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