单项选择题

All the equipment in the lab （） made in China.

A. are
B. is
C. be
D. should

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It is only when you see that with your own eyes ______ fully understand how much he loves you.
A. can you
B. you can
C. that you can
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Five hundred years later, the need for increased trade and an error in navigation（）to another European encounter with America.

A. led
B. attributed
C. contributed
D. went
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