单项选择题

Every teacher ought to（）kids to think about current issues.

A.incorporate
B.reinforce
C.challenge
D.transform

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单项选择题

A.seated
B.seating
C.having seated
D.having been seated

单项选择题

A.under no circumstances
B.under any circumstances
C.under every circumstances
D.under all circumstances

单项选择题

A.had been destroyed
B.was destroyed
C.would be destroyed
D.would have been destroyed