While ( ) to the tape,you should be careful.A.listening B.listened C.listen D.listens

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While ( ) to the tape,you should be careful.A.listening B.listened C.listen D.listens

While ( ) to the tape,you should be careful.A.listening B.listened C.listen D.listens
While ( ) to the tape,you should be careful.
A.listening B.listened C.listen D.listens

While ( ) to the tape,you should be careful.A.listening B.listened C.listen D.listens
C
这里的WHILE等于WHEN
如果选A,后面还要有个ING形式的句子,表示"一边...一边.."

选A
while后面接动词-ing,可理解为while (you are) listening to the tape

选C,while 一般与进行时连用