9、－Where are the signs you mentioned?

－They’re easy to find, if you know ______________.

A．whether to look                                          B．what to look

C．who to look                                D．where to look

9、D

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－Where are the signs you mentioned?

－They’re easy to find, if you know ______________.

A．whether to look                                          B．what to look

C．who to look                                D．where to look

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