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He met many problems he was going over his lessons.A. before B. as soon as C. since D. while 【查看更多】

 

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He met many problems------ he was going over his lessons.

A. before B. as soon as C. since D. while

 

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He met many problems            he was going over his lessons.

A. before

B. as soon as

C. since

D. while

 

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He met many problems ______ he was going over his lessons.
[     ]
A. before
B. as soon as
C. since
D. while

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He met many problems ________ he was going over his lessons.      
[     ]
A. before  
B. as soon as  
C. since    
D. while

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He met many problems       he was going over his lessons .

A. before      B. as soon as      C. since     D. while

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