问题

Parents should see to it _______ their children formthe habit of brushing their teeth every day.

A:this
B:that
C:whether
D:if

正确答案是：

同类题型

the story of Li Yunlong in the TV drama “Bright Sword” is a fiction, much of__________happened is historically true

We just need one of you for the game. ________you _______your brother can join us.

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Even though the Smiths have moved to a faraway place, we still see them ___

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