It’suncertain_______sideeffectthemedicinewillbringabout,althoughabouttwothousandpatientshavetakenit.
A.thatB.whatC.howD.whether在线课程B
解析:
考查宾语从句,it 做形式宾语,真正的宾语是后面的从句,而从句中bring about后缺少宾语,故用what,what又做定语修饰side effect,所以选B。
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