成人英语三级

单选题 Follow the directions on the bottle carefully when__________．

A．you will take the medicine
B．taking the medicine
C．to take the medicine
D．taken the medicine

参考答案：B进入在线模考
【参考译文】仔细地按照药瓶上的说明服药。
【答案解析】本题考查现在分词的用法。主句是祈使句，从句用when引导，表明从句动作与主句动作同时发生，A和C都有将来意味，可排除，D有被动意味，也不正确，故答案选B。

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