It will cost a lot of time． , I think we shall need it and it will certainly be
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It willcost a lot of time．________, I think we shall need it and it will certainly be useful.
A．What’s more
B．As a result
C．At the same time
D．After all
试题答案
答案：C
提示：| At the same time与此同时，后一句话是对前一句地强调和补充。
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