填空题
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【参考答案】
D
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相关考题
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单项选择题
You can’t see the president ______ you’ve made an appointment with him.
A．if
B．unless
C．when
D．except -
填空题
（） -
单项选择题
______, follow the directions on the bottle carefully.
A．When taken drugs
B．When drugs taken
C．When one takes drugs
D．When taking drugs
