【导读】
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1. [单选题]Our company has 30years’ experience()the machinery line.
A. on
B. in
C. about
D. of
2. [单选题]While()an enquiry,you ought to enquire into quality,specification and price etC.
A. giving
B. offering
C. sending
D. making
3. [单选题]A 3% discount will be granted only()your order exceeds US$12,000.
A. depends on
B. for condition that
C. on condition that
D. subject to