Hydrogen is one of the most important element in the universe ____ it provides the building blocks from which the other elements are produced.　 (A) so that (B) but that (C) provided that (D) in that

Hydrogen is one of the most important element in the universe ____ it provides the building blocks from which the other elements are produced.　
(A) so that
(B) but that
(C) provided that
(D) in that

出自：南阳师范学院-教育学-大学英语（四）

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