modify the right verbs into -ed participle, according to the context of this paragraph.The virus strains most likely to cause disease were identified and three were selected for vaccine development. The virus samples of each ______ strain were injected into separate batches of fertilized eggs to amplify the amount of virus.
选项:
A:identified;
B:selected;
C:injected;
D:amplified
发布时间:2024-04-07 23:17:45