Something must have happened on their way there,or they ( ) by now .A.would have arrivedB.should have arrived C.should arriveD.would arrive

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Something must have happened on their way there,or they ( ) by now .
A.would have arrived
B.should have arrived
C.should arrive
D.would arrive

B,句子翻译为:他们在路上肯定遇到啥事儿了,不然他们早就该到了.此处考查情态动词的虚拟语气