People in China used to keep records by putting a number of stones together, ___?
#65325
A
usedn’t they to
B
did they
C
used to they
D
didn’t they
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--- He has to finish the experiment today. He must be in the lab,____?---That s quite possible.
#65423
A
mustn't he
B
won't he
C
doesn't he
D
isn't he