—Hello! May I speak to Alice?—Sorry, she _____ Shanghai.
A:have gone to
B:has been to
C:has been in
D:has gone to
写出反义词
热闹—____ 保存—____
普通—____ 清清楚楚—____
①外植体消毒 ②制备MS培养基 ③接种 ④培养 ⑤栽培 ⑥移栽