—What do you think of the new English teacher?—she is an elegant lady she can be extremel

问题补充：

—What do you think of the new English teacher?

—she is an elegant lady, she can be extremely difficult to work with．

A. Even if

B. When

C. While

D. Once

答案：

A. Even if

B. When

(答案→)C. While

D. Once

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