Staff are allowed to take a ten-minute break every two hours to relax, use the bathroom or do ___________ else is necessary.  
A．somethingB．a(chǎn)nythingC．whateverD．what
C
如果把is necessary 去掉，倒是可以用something。但是很顯然這是名詞性從句中的賓語(yǔ)從句，只有C、D是關(guān)系詞，選擇C，做任何有必要做的事情。
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