单项选择题
（） , we discovered that the goods were inferior in quality to the sample.
A.After exam B.On examination C.When exam D.Upon examining
单项选择题 As a result of the （） switches, we are now faced with the following losses.
单项选择题 part of your payment has been received, but $20,000 is still （）.
单项选择题 Please （） us your lowest price for 500 men’ s bicycles.
