单项选择题

In order not to be disturbed, I spent three hours（）in my study.

A. locking
B. locked
C. to lock
D. being locked

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单项选择题
Do you still remember（）to our president when you visited our school last term

A. to be introduced
B. being introduced
C. introduced
D. to have been introduced
单项选择题
In this famous park these plants are watered（）

A. each other day
B. every other day
C. each of two days
D. every two day
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