单项选择题

Most good writers use every means ______ to make the reader's way smooth and easy.

A．at their disposal
B．at their request
C．at their will
D．at their convenience
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单项选择题
We shall send you commercial invoice, bills of lading and insurance certificates so that you can ______ the goods on a D P basis.
A．
A. consume

B．
B. complain

C．
C. concern D claim
单项选择题
The manager gave her his ______ that the complaint would be investigated.
A．admission
B．allowance
C．assurance
D．insurance
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