Why the explosion occurred was ____ the laboratory attendant had been careless.
| A．for | B．because | C．since | D．that |
相关试题
---- We’re organizing a party next Saturday, and I’d like you to come.
---- _______! I have another one that day. Thank you just the same.
| A．Good luck | B．What a pity | C．Never do it again | D．Well done |
My parents _____ in Hong Kong. They were born there and have never lived anywhere else.
| A．live | B．lived | C．were living | D．will live |
I'm trying to break the of getting up too late .
| A． | tradition | B． | convenience | C． | habit | D． | leisure |
Being a parent is not always easy, and being the parent of a child with special needs often carries with ___ extra stress. 
| A．it | B．them | C．one | D．him |
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