( ) 7.My mother _______ the whole house for two hours yesterday morning.A.has been cleaning B.cleaned 二选一,咋选?

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( ) 7.My mother _______ the whole house for two hours yesterday morning.A.has been cleaning B.cleaned 二选一,咋选?
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( ) 7.My mother _______ the whole house for two hours yesterday morning.A.has been cleaning B.cleaned 二选一,咋选?
( ) 7.My mother _______ the whole house for two hours yesterday morning.
A.has been cleaning B.cleaned 二选一,咋选?

( ) 7.My mother _______ the whole house for two hours yesterday morning.A.has been cleaning B.cleaned 二选一,咋选?
应该选择B