用反证法证明命题“三角形中必有一个内角小于或等于60°”时,首先应假设这个三角形中( )
Tom looks______ than Lucy. happy B. happier C. happiest
Chen Jie______ a stomachache. A. have B. has C. had
He jumped into the lake and ______ to it . A. swim B. swimming C. swam
Where did you go______? A. tomorrow B. today C. yesterday
Imy room and watched TV . A. clean B. cleaned C. cleaning