It is uncertain ______ side effects these weight-loss drugs will bring about, although hundreds of thousands of patients have taken it.
A．thatB．whetherC．howD．what
D

這句話考查的是主語(yǔ)從句，it是形式主語(yǔ)，因?yàn)槭莡ncertain，所以主語(yǔ)是不確定的事，side effects缺少修飾，填what。句意是：雖然幾十萬(wàn)患者采取了這些減肥藥但是不確定它會(huì)產(chǎn)生什么副作用。選D。
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