题目内容
完成B句，使其与A句意思相同或相近。（每空一词）
A. There’re about 5 million species in the ocean and we have yet to learn much about them.
B.There’re about 5 million species in the ocean, about ______ ______ ______ much waiting for us to learn.
答案：
解析：
解析：
which there is。 wait for等待
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