单项选择题

During the Tang dynasty(唐朝), nearly everything produced in the world __________ on the streets of Chang’an.

A.isfound
B.hasbeenfound
C.willbefound
D.couldbefound
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单项选择题
集合M={2,4,6,8,10}，N{x|-1＜x＜6}，则M∩N=（）
A.{2,4}
B.{2,4,6}
C.{2,4,6,8}
D.{2,4,6,8,10}
单项选择题
—Alex, come down to play football.—I can’t. Mom said I __________ clean my bedroom before doing anything else.
A.hadto
B.will
C.usedto
D.can
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