difficult the task may be we must fulfil it this month.A. No matter howB. No matter what

问题补充：

difficult the task may be, we must fulfil it this month.

A. No matter how

B. No matter what

C. No matter when

D. No matter where

答案：

(答案→)A. No matter how

B. No matter what

C. No matter when

D. No matter where

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