Even though only parts of clay vessels may be recovered, these pottery shards ar

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试卷: SAT句子挑错练习02[查看]
Even though only parts of clay vessels may be recovered, these pottery shards are invaluable to the archaeologist because it is virtually indestructible.
A: Even though
B: may be
C: invaluable to
D: it is
E: no error

参考答案: D

本题解释:
they are