It will cost a lot of time. ______，I think we shall need it and it will certainly be useful to us______.

A.What’s more;sooner or later

B.As a result;now and then

C.At the same time;more or less

D.After all;here and there

C


解析:

此處at the same time意為“但是，然而”。這恰好與下文的more or less意義一致。

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