Europeans always hold their fork in the left hand, ________Americans switch it between their left and right hands.
A．beforeB．because
C．whileD．since
C
while意為“然而”，此處表示對(duì)照對(duì)比關(guān)系。句意：歐洲人總是用左手握叉子，但是美國(guó)人總是左右手交換著使用。before意為“在……之前”引導(dǎo)時(shí)間狀語從句；because引導(dǎo)原因狀語從句，意為“因?yàn)椤保籹ince意為“既然”引導(dǎo)原因狀語從句，意為“自從”引導(dǎo)時(shí)間狀語從句。
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