Because he is head of the government, he is supposed .
A. /; to taking
B. /; to take the lead
C. the; taking the
D. the; taking
网友回答
A. /; to taking
(答案→)B. /; to take the lead
C. the; taking the
D. the; taking
解析：考查冠词和固定搭配。职务、头衔前面不能加冠词，head在此意为“首长，首脑”，前面不适用冠词，排除C、D；be supposed to do sth应该做某事，排除A。故选B。