His explanation that he was at loss what to do next doesn't hold water.A. a ;/B. a; theC.

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(答案→)A. a ;/
B. a; the
C. the; /
D. /;/
解析：考查冠词：句意：他解释说他不知道下一步该做什么是说得通的。第一空填a，at a loss不知所措，第二空不填，hold water是说得通，站得住脚； 经得起检验。选A。