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答案部分
1考点：情态动词试题解析：用must来提问，肯定回答用Yesyoumust（是的，你必须）；否定回答用Noyou
eed
’t或Noyoudo
’thaveto（不，你没有那个必要）；
eed
’t没有必要。故选A答案：A2考点：情态动词
f试题解析：must
’t：禁止、不许，不用在否定猜测中may
ot：可能不是，用在不确定猜测中；
eed
’t没有必要；ca
t：不可能。（表示否定的推测）根据MrLihasgo
etoAmerica可知那个人不可能是李先生。故选C答案：C3考点：情态动词试题解析：往河里扔垃圾这个行为是禁止、不许的，故排除排除A、C。又因为rubbish与throw之间存在被动关系，用被动语态，故选B答案：B4考点：情态动词试r