the ocean liners that used to cross the Atlantic Ocean now _____ in cruise

题目

the ocean liners that used to cross the Atlantic Ocean now _____ in cruise
A specialize .B specializing

答案

答案：A
翻译：过去常常穿越大西洋的那些远洋客轮现在专门从事巡航业务.
1.分析句子结构,可知主句为：The ocean liners now ___ in cruise.
而that used to cross the Atlantic Ocean则为定语从句,修饰主句主语the ocean liners.
2.由此可知,选项为主句的谓语,所以答案为A.
单独的现在分词即答案B是无法充当句子谓语的,排除B.
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