Question

【题目】—Is that girl under the tree Mary?
—No,it ________be Mary, she is in Beijing now.
A.can't
B.needn't
C.shouldn't
D.mustn't

Answer 1

【答案】A
【解析】句意：-那个在树下面的女孩是Mary吗？-不，不可能是Mary，她现在在北京。can't不可能；needn't不需要，没有必要；shouldn't不应该；mustn't禁止，不要。根据对话的意思可知，这里表示的是推测，表示否定的意思，应该用can't。故选A。