【題目】It is uncertain ___________ side effect the medicine will bring about，although about two thousand patients have taken it.

A. that

B. what

C. how

D. whether

【答案】B

【解析】句意：盡管說已經(jīng)有大約兩千名病人服用了這種藥品，但是，這種藥品會帶來什么副作用還不明確。本題考查名詞性從句。本題設空處需引導主語從句，that無實際意義，在從句中不作成分；what什么，在從句中可作主語、賓語或表語，還可作定語修飾名詞；how如何，多么，在從句中作方式狀語或修飾形容詞、副詞；whether是否，在從句中作狀語，不修飾名詞。side effect為名詞短語，故用what修飾。

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