Question

—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 back	B．that he has come back
C．why he has come back	D．how he will be back

Answer 1

A

解析試題分析: 句意：湯姆還在紐約還是已經回國了？我不確定是否他已經回來了。我會打電話確認的。if he has been back是否他已經回來了， that he has come back他已經回來了，why he has come back為什么他已經回來了，how he will be back他將怎么回來；根據not sure不確定，可知選A。
考點：考查賓語從句。