单项选择题

______ you understand this rule, you’ll have no further difficulty.

A．Once
B．Unless
C．Only
D．Until
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单项选择题
What did the thief take from the shop
A．He took the watch which was worth $1,500.
B．He took the camera which was worth $15,000.
C．He took the necklace which was worth $15,000.
单项选择题
Why did Mr. Blue buy a camera
A．He wanted to photograph all the things in the shop.
B．He wanted to photograph anyone who broke into the shop at night.
C．He wanted to photograph his shop.
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