She isnewcomer tochemistry but she has already made some important discoveries.

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问题 She is______newcomer to______chemistry but she has already made some important discoveries.

选项 A、the; the
B、the; /
C、a; /
D、a; the

答案C

解析此句中并没有特指的含义，故两空中都不能填the，因此选C项。

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