I didn't answer the phone( )I didn't hear it ring

I didn't answer the phone( )I didn't hear it ring
A if B unless C although D because
英语人气:269 ℃时间:2020-01-17 22:56:31
优质解答
选择D.
A 如果、B 除非、C尽管、D 因为
句子为过去式,所以排除A;B、C选项意思不通
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