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

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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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