你可能感兴趣的试题
sent sends is sending has sent
2xdx-dy 2xdx+dy -2xdx+dy -2xdx-dy
edx-dy dx+edy edx+dy edx+edy
0<dy<△y 0<△y<dy △y<dy<0 dy<△y<0
sent sends is sending has sent
doesn’t belong to belongs to isn’t belonging to belonged to
3 year old 3﹣year﹣old 3﹣years﹣old 3 years old
a Chinese old interesting pottery an old interesting pottery Chinese an pottery old interesting Chinese an interesting old Chinese pottery
0<dy<△y. 0<△y<dy. △y<dy<0. dy<△y<0.
sent sends is sending has sent
dx+dy 2dx+2dy 2dx+dy dx+2dy
0<dy<Δy. 0<Δy<dy. Δy<dy<0. dy<Δy<0.
3 year old 3 - year - old 3 - years – old 3 years old
dated from; repaired dating from; repairing dating back to; to repair dated back to; to be repaired
edx+dy e2dx-dy dx+e2dy edx+e2dy
3 year old 3-year-old 3-years-old 3 years old