【題目】—I don’t know________．

—Because he has to look after his mother．

A．why he is leaving

B．why is he leaving

C．whether he is leaving

D．whether is he leaving

【答案】A

【解析】賓語從句要用陳述句語序，先排除B和D；再結合答語可知引導詞應是why。故答案為A。

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