不完整的题句，只好搜索网络，发现题改自：
高考复习题改错10篇_百度文库
They are taking great trouble to support a bike, with my mother even carrying a first-aid box.
选改错，第一个a-->the
答案自然就出来了，A. carrying,
with+复合宾语。 with sb. doing sth.
精选高考英语语法填空15篇
They are taking great trouble to support the bike, with my mother even 6 (carry) a first-aid box.
原题也有可能改自此题。
C 主谓关系
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