问题描述：
1.----Who is knocking at the door
1.----Who is knocking at the door ,mary?-----It ( )Susan A must be B may be 2.nothing serious.You caught ( )cold .A a bit B abit of C little 3.Though some of the suits in the shop are nice .But they ( ) too much A cost B pay 说明原因
1.----Who is knocking at the door ,mary?-----It ( )Susan A must be B may be 2.nothing serious.You caught ( )cold .A a bit B abit of C little 3.Though some of the suits in the shop are nice .But they ( ) too much A cost B pay 说明原因
问题解答：
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