(Even though) Sandra (has been studying) English for three years (before) she ca

游客2025-03-14  6

问题 (Even though) Sandra (has been studying) English for three years (before) she came to the United States, it is difficult for her (to express herself).

选项 A、Even though
B、has been studying
C、before
D、to express herself

答案 B

解析
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