单选题 That man must have the strength of a hippopotamus, or he never______that great beast.
A.could have vanquished B.would vanquish
C.should have vanquished D.had vanquished

【正确答案】 A
【答案解析】[解析] 28.此句中的or意为“否则”,此句为假设条件被隐蔽的虚拟句。