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
B
考查賓語(yǔ)從句。賓語(yǔ)從句中 bring about后缺少賓語(yǔ)，故用what 作定語(yǔ)修飾side effect，句意：還不清楚這種藥會(huì)帶來(lái)什么樣的副作用，雖然大約兩千名病人已經(jīng)服用過(guò)。故選B。
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