They ______ so tired if they ______ for a whole day.        
A．wouldn’t feel, didn’t walkB．wouldn’t feel, weren’t walking
C．wouldn’t be feeling, weren’t walkingD．wouldn’t be feeling, hadn’t been walking
D

試題分析：情景對話 句意為：如果他們不走一整天，他們就不會感到累
If引導的虛擬語氣，從此題可判斷為對過去事件的虛擬，故從句的時態(tài)應用過去完成進行時，主句用would+動詞原形
點評：此題我主要考察考生對if引導的虛擬語氣的掌握程度和熟練情況�？忌趶土晻r，應對虛擬語氣進行強化記憶，形成正確的語感。
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