你可能感兴趣的试题
sing to sing singing sang
A. sings; sings sing; sing sang; sings sings; sang
sing sang to sing singing
she sang sang she did she sing she did sing
to sing sing sang to be sang
being sung; sang sang; singing sung; sing to be sung; to sing
to sing sang sing to be sung
being sung, sang sang, singing sung, sing to be sung, to sing
sing sang singing to sing
sing sang to sing to singing
sing sang to sing singing
she sang sang she did she sing she did sing
sing to sing singing sang
sing to sing singing sang
sing sang to sing singing
sing singing sang to sing