问题

Mr Green didn’t know ______ last night.
A:when does his son come back
B:when his son comes back
C:when his son come home
D:when his son came home
B:when his son comes back
C:when his son come home
D:when his son came home
正确答案是:
同类题型
Please remind me _______ to my teacher .
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There are students in our school.
How many children have you got ? —Two , _______ of them are studying in the university.