____ the help of experienced career instructors, this type of job-hunting training ____ to be very efficient.
A．By; has provedB．With; has provedC．Under; is provingD．With; is proved
B
本題主要考查固定搭配的識記及動詞的語態(tài)。根據(jù)help的搭配要求，介詞須用with，從而排除選項A、C；動詞prove表示事物的性質(zhì)時，為不及物動詞，不用被動形式，于是本題的正確答案為B。
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