Computersareusedinalmosteveryfieldnow,buttwentyyearsago...

问题详情：

Computers are used in almost every field now, but twenty years ago, no one ________ imagine that they were to become so popular and useful.

A. should  B. could  C. need  D. must

【回答】

B

知识点：情态动词

题型：选择题