百度地图用经纬度定位:when___according to the directions ,the drug has no side effect .A .taken B.to be taken

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when___according to the directions ,the drug has no side effect .A .taken B.to be taken
我知道选A,但为什么不选B,两个有什么区别,把句子怎么改可以用B?
还有个题,the news reporters hurried to the airport,only ____the film stars had left.
A .to be told B.told
为什么用A 而不用B.两个题有什么区别那?