问题
It has been announced that all the students______ put on the masks before going to school in case they are infected withSARS virus
A:can
B:must
C:shall
D:ought to
B:must
C:shall
D:ought to
正确答案是：
同类题型
William Shakespeare occupied a ______ position in English literature.
Sorry to disturb you, ________ can I use yourphone– Oh, go ahead.
We’veofferedherthejob,butIdon’tknow_________she’llacceptit
I don’t like action films. They are too noisy.— ________. I never watch action films.
’t like Aunt Lucy, who _____without warning and bringing us presents.