单项选择题

（）you are familiar with the author's ideas, try reading all the sections as quickly as you possibly can.

A．Now that
B．Ever since
C．So that
D．As long as

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I walked too much yesterday and（）are still aching now.

A．my leg muscles
B．my leg's muscles
C．my muscles of leg
D．my muscles of the leg
单项选择题
Hardly（）when a loud explosion was heard.

A．the train had started
B．the train had been started
C．had the train started
D．did the train start
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