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单项选择题

Polly enjoys （）in a band in her free time.

A.play the guitar
B.to playing the guitar
C.playing the guitar

单项选择题

Certificate of Fitness for the Carriage of Liquefied Gases in Bulk shall be carried on board by （）．

A.gas carriers constructed on or after 1July 1986
B.gas carriers constructed before 1July 1986
C.All chemical tankers
D.oil tankers of 150gross tonnage and above