30．—Whathasmadehimlooklikelackingsleep?30．—Whathasmadehimlooklikelackingsleep?—hiswifeisillandhehastogetupseveraltimesanighttoattendtoher.A．ForB．BecauseC．ThatD．What为什么选C不能选B?

Question

30．—What has made him look like lacking sleep?
30．—What has made him look like lacking sleep?— his wife is ill and he has to get up several times a night to attend to her.A．For B．Because C．That D．What
为什么选C不能选B?

Answer 1

because是用来回答why的,这个题目回答的是主语what,完整的回答是That his wife is ill and he has to get up several times a night to attend to her has made him look like lacking sleep.
that引导的是主语从句,只起引导词作用,不做任何成分.