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
If the work ______ by the end of the month is delayed, the construction company will be fined.
A．to be completed
B．is completed
C．to have been completed
D．being completed
单项选择题
It was not until I ______ your letter that I ______ all about the matter.
A．have read; knew
B．would read ;had known
C．read; had known
D．had read; knew
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