Officials of the office said they had no reasonable explanation.

But there wasn't any reasonable explanation for his course after that.

Once they seemed to include the only reasonable explanation for what happened.

Only recently have I found what seems to be a reasonable explanation, and the answer is simple.

But any reasonable explanation would take several hours.9$ '11W's quite all right.

He was trying to think of some reasonable explanation for what had happened.

If seen, he would be able to provide a reasonable explanation for being in the area.

That was the only reasonable explanation I could think of for the evidence in my hand.

Then a small thing happened that had no reasonable explanation at all.

He could offer no reasonable explanation for having it with him.