单项选择题

All these dictionaries are a great help to you ，（）

A.are they
B.aren’t they
C.are all these dictionaries
D.aren’t all these dictionaries

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单项选择题
Virtue and vice are before you ;____ leads you to happiness,_____ to misery.

A.the former…latter
B.a former…a latter
C.the former…the latter
D.former…latter
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