单项选择题

Without proper lessons, you could ______ a lot of bad habits when playing the piano.

A．keep up
B．pick up
C．draw up
D．catch up
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单项选择题
A year ago the firm had a ______ loss of 4.3 million dollars or 20 cents a share after all necessary deduction.
A．total
B．gross
C．net
D．clear
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．consume
B．complain
C．concern
D．claim
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