A:had played; was going to do
B:played; did
C:was playing; was going to do
D:had played; did
某同学“用显微镜观察人口腔上皮细胞装片”时看到的图象在视野的右方.若使图象中口腔上皮细胞移至视野的中央,应将玻片标本( )
印度的地形和地势特征可以概括为( )
下列各组词语中,没有错别字的一组是( )。