—Do you know        World Water Day is?
—On March 22nd.

A. when                            
B. where
C. what                              
D. which
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科目:初中英語 來源:同步題 題型:單選題

-Do you know        World Water Day is?
-On March 22nd.
[     ]
A. when                            
B. where
C. what                              
D. which

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