OIL SHALE IS A SOFT, FINE-GRAINED SEDIMENTARY ROCK _______ OIL AND...

51. - 2 DE THAM KHAO THI THU DAI HOC MON ANH VA DAP AN
Tiếng Anh 2 DE THAM KHAO THI THU DAI HOC MON ANH VA DAP AN

51. Oil shale is a soft, fine-grained sedimentary rock _______ oil and natural gas are obtained.

A. from

B. is from

C. is which

D. from which