If you ____ careful, you will fall off the tree.
A.don't be B.aren't C.are D.do be
Tom's father always makes him ___ a lot of extra homework.
A.do B.to do C.doing D.does
第一道,主将从现(主句用将来时,从句用一般式)选B 如果你不仔细点,就会从树上掉下去
第二道,make sb. do sth. 选A
第二道,make sb. do sth. 选A
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