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The existence of water on Mars has been the focus of intense investigation; << in addition to the possible holding of small quantities in subsurface deposits and deep pits >>, the planet is also expected to retain large amounts of water in its polar ice caps.
(A)
in addition to the possible holding of small quantities in subsurface deposits and deep pits
(B)
in addition to the possibility to hold small quantities in subsurface deposits and deep pits
(C)
besides the possibility that it holds small quantities in subsurface deposits or deep pits
(D)
besides possibly holding small quantities in subsurface deposits or deep pits
(E)
beside possibly holding small quantities in subsurface deposits or deep pits
(A)
in addition to the possible holding of small quantities in subsurface deposits and deep pits
(B)
in addition to the possibility to hold small quantities in subsurface deposits and deep pits
(C)
besides the possibility that it holds small quantities in subsurface deposits or deep pits
(D)
besides possibly holding small quantities in subsurface deposits or deep pits
(E)
beside possibly holding small quantities in subsurface deposits or deep pits












