问题描述:
the bell____the end of period rang and we had to stop our discussion.
A.indicating B.indicated C.to be indicated D.being indicated
解释下为什么选A,顺便解释一下这句的意思
A.indicating B.indicated C.to be indicated D.being indicated
解释下为什么选A,顺便解释一下这句的意思
问题解答:
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