The drug used to treat this disease causes bad side effects, some of which ________ deadly.
A．isB．a(chǎn)re
C．wasD．were
B
B 考察主謂一致。Some of which引導(dǎo)非限制性定語從句，在從句中做主語，修飾先行詞bad side effects，故從句中使用復(fù)數(shù)形式，由此排除AC，由主句的時(shí)態(tài)和語境可知表示客觀性，故使用一般現(xiàn)在時(shí)。故B正確。
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