The engineer must be at home,for the light is on,___?A.mustn't heB.isn't hewhy we choose B?

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The engineer must be at home,for the light is on,___?A.mustn't heB.isn't hewhy we choose B?

The engineer must be at home,for the light is on,___?A.mustn't heB.isn't hewhy we choose B?
The engineer must be at home,for the light is on,___?
A.mustn't he
B.isn't he
why we choose B?

The engineer must be at home,for the light is on,___?A.mustn't heB.isn't hewhy we choose B?
must表示判断时,反意疑问句仍然按照原来那个句子来问,isn't he
must表示必须时,如 we must go home now,mustn't we?

表推测的,所以是b