【題目】The ________ expression on her face suggested that she _________ the _________ physics problem.

A．puzzling；was puzzled by；puzzled

B．puzzling；be puzzled over；puzzled

C．puzzled；be puzzled by；puzzling

D．puzzled；was puzzling over；puzzling

【答案】D

【解析】

試題分析：考查動詞。句意：她臉上困惑的表情顯示出她正在因那道令人費解的物理題而困惑，puzzled以人為主語，puzzling以物為主語，表示令人困惑的，be puzzling over 固定用法，表示因...而困惑，故選D項。

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