问题
选择题
Some aspects of a pilot’s job__________ be boring, and pilots often ________ work at inconvenient hours．
A．can; have to
B．may; can
C．have to; may
D．ought to; must
答案
答案：A
考查情态动词。Can表示可能，have to 必须；不得不
搜题请搜索小程序“爱下问搜题”