问题
选择题
You should move back and forth while _______ basketball.
A．to play
B．playing
C．are playing
D．plays
答案
答案：B
while 引导的是时间状语，当主句与从句的主语一致，故选答案为B
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You should move back and forth while _______ basketball.
A．to play
B．playing
C．are playing
D．plays
答案：B
while 引导的是时间状语，当主句与从句的主语一致，故选答案为B