单项选择题

Since I began to work here three years ago, this factory ______ in size.

[A] had doubled
[B] has doubled
[C] doubled

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If sweets ______ bad for the teeth, I will stop eating them.

[A] are
[B] were
[C] will be

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Stamps are used for ______ letters.

[A] sending
[B] writing
[C] carrying

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