单项选择题

Prices reach equilibrium at the level at which quantity demanded ______ quantity supplied.

[A] is equal to
[B] equal
[C] equals to
[D] is equal
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单项选择题
Since 1970, millions of enthusiasts ______ a substance which they believe can remedy the common cold — Vitamin C.
[A] have taken
[B] have been taking
[C] have been taken
[D] have being taken
单项选择题
The price of seafood used to be much lower than now, ______
[A] wasn't there
[B] wasn't it
[C] doesn't it
[D] didn't it
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