单项选择题

He promised me a letter; he ought to ______ it days ago.

A．have written
B．write
C．had written
D．be writing
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单项选择题
Industry ______ only ten percent of the smog in Los Angeles.
A．calls on
B．mounts to
C．appeals to
D．accounts for
单项选择题
They awoke to find the maid had left the remnants of dinner on the table.
A．list of items for
B．invitations to
C．leftovers of
D．preparations for
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