题目内容

—Is Tom still in New York or already back at home? 
—I’m not sure _________. I’ll call to make sure.
A．if he has been backB．that he has come back
C．why he has come backD．how he will be back
A

试题分析: 句意：汤姆还在纽约还是已经回国了？我不确定是否他已经回来了。我会打电话确认的。if he has been back是否他已经回来了， that he has come back他已经回来了，why he has come back为什么他已经回来了，how he will be back他将怎么回来；根据not sure不确定，可知选A。
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