He didn't understand that business letter because it was written _ English.A.onB.inC.with请说原因.

He didn't understand that business letter because it was written _ English.A.onB.inC.with请说原因.
He didn't understand that business letter because it was written _ English.
A.on
B.in
C.with
请说原因.

He didn't understand that business letter because it was written _ English.A.onB.inC.with请说原因.
B　用语言用in

答案：

【B.in】

语言English前加介词in
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