Copernicus maintained that the earth_____round the sun.
A
表述永恒的真理或客观规律用一般现在时，不管主句谓语用什么时态。而“地球绕着太阳转”是客观规律，所以选a
_____you understand this rule ，you‘ll have no difficulty in dealing with such problems.
Copernicusmaintainedthattheearth_____roundthesun.
Hedrovefastandarrivedanhour_____ofschedule.
Iwilldotheclearingifyousee_____thelunch.
Idon‘tfeellike_____anythingnow.
