选择主动或被动语态填空。This house is quite old. It _______ (build) over 100 years ago.
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选择主动或被动语态填空。My grandfather was a builder.He _______ (build) this house many years ago.
选择主动或被动语态填空。Sometimes mistakes _________ (make).It is inevitable.
选择主动或被动语态填空。 It's a serious problem. I don't know if it ________ .(can/ solve)
选择主动或被动语态填空。 The letter _______ (send) a week ago and it _______ (arrive) yesterday.