单项选择题

A．They stopped using bricks in their future construction.
B．They always used steel when building buildings.
C．Buildings got higher in Chicago.
D．Jenny became rich by his discovery.
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单项选择题
A．Teach David’s class while he is absent.B．Give Professor Winston the key to David’s office.C．Leave a message on the board in David’s classroom.D．Bring David the homework that was due today.
A．Teach David’s class while he is absent.
B．Give Professor Winston the key to David’s office.
C．Leave a message on the board in David’s classroom.
D．Bring David the homework that was due today.
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