It  was  about  600  years  ago ______the  first  clock  with  a  face  and  an  hour  hand  was  made .   
#85478
A
that
B
until
C
before
D
when
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I can’t remember _______ you started doing the work.
#84878
A
that it was when
B
when it was that
C
when was it that
D
that was it when
--     you called yesterday evening? ---My sister. Why?
#85225
A
Who it is that
B
Who is it that
C
Who was it that
D
Who it was that