He __________ well in the exam last week, so he __________ hard now.
A. did, studied    
B. didn't, is studying   
C. didn't do, is studying
D didn't, studying   
C
句意：上周的考試他做的不好，因此現(xiàn)在他正在努力學(xué)習(xí)。根據(jù)句意可知前半句考查一般過去時，后半句考查現(xiàn)在進行時的用法，故選C。
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