单项选择题

Linda feels exhausted because she（）so many visitors today.

A．has been having
B．had been having
C．was having
D．had had

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单项选择题
Only when in danger（）human beings.

A．will attack most snakes
B．will most snakes attack
C．snakes will most attack
D．most snakes will attack
单项选择题
If（）in the fridge, the fruit can remain fresh for more than a week.

A．keeping
B．kept
C．be kept
D．to keep
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