【題目】We all know that a smile is usually a sign ________ people feel friendly and happy.
A.when
B.how
C.that
D.if

【答案】C
【解析】句意：我們知道微笑通常是一個(gè)人感到友好和愉悅的標(biāo)志。sign是先行詞，people feel friendly and happy是解釋說明sign的內(nèi)容，而且從句中意思完整，不缺成分，故用that來引導(dǎo)。所以答案是C。

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