B
父母早晨五点钟动身的,照理说现在该到了.（其实没到,虚拟语气）
by now是完成时态,排除A、D,B、C都可表示虚拟,但C之前必须有虚拟条件,比如“如果父母再早点动身的话,现在就能到了”,所以这里又排除C,B可以,它的特点前半句是事实,后半句是与事实相反的判断.
A.would be arrivingB.should have arrivedC.would have arrived
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