问题
选择题
helicopter can take off and land straight up or down, and can also stay
still in air.
A．The; an
B．A; the
C．A; 不填
D．The; 不填
答案
答案：B
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helicopter can take off and land straight up or down, and can also stay
still in air.
A．The; an
B．A; the
C．A; 不填
D．The; 不填
答案：B