单项选择题

This is the reason ______ an airplane can fly in the sky.

A．why
B．which
C．for that
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单项选择题
If I ______enough money, I ______ around the world.
A．had... would travel
B．have... would travel
C．had... will
单项选择题
A large box of jewels ______ by the explorers last year.
A．was found
B．were found
C．found
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