When the old man was alive,he ____ sit for hours at the door.A.would B.could C.must D.might为什么不选B?选哪个,为什么

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When the old man was alive,he ____ sit for hours at the door.A.would B.could C.must D.might为什么不选B?选哪个,为什么
When the old man was alive,he ____ sit for hours at the door.
A.would B.could C.must D.might
为什么不选B?选哪个,为什么

When the old man was alive,he ____ sit for hours at the door.A.would B.could C.must D.might为什么不选B?选哪个,为什么
没错,c讲的通,must表推测.

A
但是如果还有下文,B,C,D 都可以,文法上是没错的

虚拟语气,选A

a吧。就跟if i were you, i would......一样。

c 表示肯定的意思