It was about 600 years ago ________ the first clock was made.
[ ]
A.
that
B.
until
C.
before
D.
when
Look at this!It's broken now!You ________ have been careful!
[ ]
A.
could
B.
must
C.
would
D.
should
It was about 600 years ago ________ the first clock was made.
that
until
before
when
Look at this!It's broken now!You ________ have been careful!
could
must
would
should