Newton proved that it is ______ the moon is pulled out of a straight path and kept in orbit.

Newton proved that it is ______ the moon is pulled out of a straight path and kept in orbit.

题目
Newton proved that it is ______ the moon is pulled out of a straight path and kept in orbit.
A.by the force of gravity
B.by the force of gravity which
C.by the force of gravity that
D.by the force of gravity with which
答案
C强调句
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