We know a good deal about the people who lived in China 4, 000 years ago, because they ______write and leave written records for those who lived after them.
A.could | B.should | C.must | D.shall |
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We know a good deal about the people who lived in China 4, 000 years ago, because they ______write and leave written records for those who lived after them.
A.could | B.should | C.must | D.shall |