No matter how fast we worked, ____.
A．we couldn’t catch up with themB．a(chǎn)nd we couldn’t catch up with them
C．so we couldn’t catch up with themD．but we couldn’t catch up with them
A                      
no matter how 引導(dǎo)讓步狀語(yǔ)從句,故只可選A,構(gòu)成主從復(fù)合句。  
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