单项选择题

______ an answer, he decided to write another letter to them.

A．Receiving
B．Not being received
C．Having not received
D．Not having received
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单项选择题
The shop doesn't have air conditioners in ______ at the moment, but they expect to have some in a week.
A．stock
B．storage
C．sale
D．demand
单项选择题
We regret ______ you that the materials you ordered are out of stock.
A．informing
B．to inform
C．having informed
D．to have informed
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