She add two slices ( ) chicken ( ) the sandwich.A,to ,of B,of,on C,of,to D,to,to

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She add two slices ( ) chicken ( ) the sandwich.
A,to ,of B,of,on C,of,to D,to,to

C
two slices of ..两片……
add .. to... 加入

B
two slices of ..两片……
add .. on... 加...在...上