It's difficult to how much time the project will take.

A．count B．complete

C．calculate D．a(chǎn)ccount

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閱讀下面短文，在空白處填入適當(dāng)?shù)膬?nèi)容（1個(gè)單詞）或括號(hào)內(nèi)單詞的正確形式。

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