1,Let's go dancing tonight.--Sorry,I_____.I have to go to the cinema.A,can't B,mustn't C,may not2,David talked with a friend of ___ on the internet for a long time yeaterday.A,he B,his C,him请说明选择理由

1,Let's go dancing tonight.--Sorry,I_____.I have to go to the cinema.A,can't B,mustn't C,may not2,David talked with a friend of ___ on the internet for a long time yeaterday.A,he B,his C,him请说明选择理由
1,Let's go dancing tonight.--Sorry,I_____.I have to go to the cinema.
A,can't B,mustn't C,may not
2,David talked with a friend of ___ on the internet for a long time yeaterday.
A,he B,his C,him
请说明选择理由

1,Let's go dancing tonight.--Sorry,I_____.I have to go to the cinema.A,can't B,mustn't C,may not2,David talked with a friend of ___ on the internet for a long time yeaterday.A,he B,his C,him请说明选择理由
1.A
mustn't 一定不要,不许,表“命令,禁止”
例：You mustn't smoke.
may not 不可以
can't 不能
B
a friend of his= one of his friends

a a是不能的意思，b是不必要，，c是可以不
汉语意思出来了，就选出来了
b 这里b选项其实是his friends的缩写。his做反身代词刚好有那个意思了。。

1.A
2.C

1选A. A,can't 不能。 B,mustn't不准，不允许。 C,may not 可能不故选A 2选B A,he人称代词主格。 B,his 形容词性物主代词或名词性物主代词，在此为名词性物主代词。双重所有格= his friends C,him 宾格人称代词。故选B