( )We have to study our English test and we are busy what we learnt. A. at, review B. for, reviewing C. on, reviewing D. for, review 【查看更多】

 

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We have to study _____our English test and we are busy ________what we learnt.
[     ]
A. at, review    
B. for, reviewing   
C. on, reviewing   
D. for, review

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