问题
选择题
— Is there an express to Beijing tonight?
— There ______ be, but you’d better call the booking office to make sure.
A．can
B．might
C．will
D．must
答案
答案：B
情态动词表推测can用于否定句或疑问句中； might用于肯定句语气轻； will 表意愿；must表肯定推测。