单项选择题
6革兰氏染色阳性菌的颜色为()。 A、兰色 B、红色 C、黄色 D、蓝紫色
单项选择题6革兰氏染色阳性菌的颜色为()。 A、兰色 B、红色 C、黄色 D、蓝紫色
The first sentence of a paragraph is an introductory se...
问答题The first sentence of a paragraph is an introductory sentence, also called _______ sentence.
It was essential that the application forms ______ back...
单项选择题It was essential that the application forms ______ back before the deadline. A. must be sent B. be sent C. would be sent D. were sent
