Question

—Can I go to the park, Mum?
—Certainly. But you ______ be back by six o’clock.

A．can

B．may

C．might

D．must

Answer 1

D

考查情态动词的用法。同意孩子去公园，但是有要求：必须在6点之前回来。must“一定，必须”。