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It's nearly eight o'clock,i must hang up and get down to wor

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It's nearly eight o'clock,i must hang up and get down to work.My boss ___ be here at any moment.
A should
B must
C could
D would
顺便解释下句子,
It's nearly eight o'clock,i must hang up and get down to wor
A,
should 表示“我老板应当随时会到”.
由于 should 的用法最复杂,英语考试中如果让你从should,would,could 里选一个的话,超过70%的概率是选should.
should 的定义:
1
—used in auxiliary function to express condition
2
—used in auxiliary function to express obligation,propriety,or expediency
再问: 可以帮忙把上面那一段翻译一下吗。。。。。。。auxiliary function是什么。。。。。
再答: auxiliary function 助动词的作用