问题
选择题
____ we know now, oceans cover more than 70 percent of the earth.
A．That
B．Which
C．As
D．What
答案
答案：C
as引导非限制性定语从句。as从句中的谓语常常是: be said, be known, be reported等。
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____ we know now, oceans cover more than 70 percent of the earth.
A．That
B．Which
C．As
D．What
答案：C
as引导非限制性定语从句。as从句中的谓语常常是: be said, be known, be reported等。