My PC is out of order, the experiment has to be put off.

admin2022-06-18  23

问题 My PC is out of order, the experiment has to be put off.

选项 A、being
B、was
C、be
D、has been

答案A

解析 本题两个分句之间没有连接词,逗号不能连接两个句子,因此可以将前面半句改为独立主格结构,表原因,A符合要求。
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