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（请给出正确答案）
（ ）,photo synthesis is the ultimate source of food for almost all organisms on earth.
A.It is an extremely important process
B.An extremely important process,it is
C.That an extremely important as
D.An extremely important process
B.An extremely important process,it is
C.That an extremely important as
D.An extremely important process
参考答案
参考解析
解析：该题考查句子结构。题干中photo synthesis意为“光合作用”，根据选项可知，空格处所填内容是photo synthesis的同位语形式，选项A、B不合句子结构，C选项不合说法。故答案为D。
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