单项选择题

It was not until 1920（）regular radio broadcasts began.

A．while
B．which
C．that
D．since

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One day Cruse walked along（）towards his boat.

A．beaches
B．the beach
C．sand
D．sands
单项选择题
Can you tell me the name of the factory（）you visited last week

A．what
B．where
C．that
D．when
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