I don't know how____across the river yesterdayA.did he swim B.he swam C.does he swim D.he swims

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I don't know how____across the river yesterdayA.did he swim B.he swam C.does he swim D.he swims

I don't know how____across the river yesterdayA.did he swim B.he swam C.does he swim D.he swims
I don't know how____across the river yesterday
A.did he swim B.he swam C.does he swim D.he swims

I don't know how____across the river yesterdayA.did he swim B.he swam C.does he swim D.he swims
B
宾语从句要用陈述句的语序.

a

额。。。。确定???我忘记了。。。。