单项选择题

An intimate and ______ knowledge of how you are doing in the customer's eyes is critical.

A．objective
B．subordinate
C．optional
D．subsequent
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单项选择题
The following account by the author ______ the difference between European and American reactions.
A．illustrates
B．acquires
C．demands
D．deletes
单项选择题
The philosophy class began with twenty students but three ______ after the midterm exam.
A．picked up
B．turned out
C．dropped out
D．kept up
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