A hearty laugh relieves physical tension, ________ your muscles relaxed for over half an hour.
A．to leaveB．left
C．leavingD．leave
C
C 考察非謂語動詞。句義：開懷大笑可以緩解身體緊張，至少可以使你的肌肉放松半小時。在題干中，空格處做伴隨狀語。且與邏輯主語laugh構(gòu)成主動關(guān)系。C項我現(xiàn)在分詞，表示主動，與題意相符。故C正確。
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