问题
选择题
Twenty boats left Tianjin, for the east at high speed.
A．to set sail
B．to set sails
C．setting sail
D．setting sails
答案
答案：C
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Twenty boats left Tianjin, for the east at high speed.
A．to set sail
B．to set sails
C．setting sail
D．setting sails
答案：C