I really don't know ________ he will come back this evening or not.(whether, weather)

答案：whether
解析：

　　解析：本句是一個含賓語從句的復(fù)合句，應(yīng)選用一個連詞作引導(dǎo)詞。weather“天氣”，是名詞。

　　拓展延伸：學(xué)習(xí)同音詞要注意它們的詞性。又如：write－right, by－buy－bye, blue－blew, knew－new, weak－week等等。


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