10. The third member had been with the back-up teams at the Hub; he was an expert on space [reconnaissance] instrumentation, but on this trip he would have to provide consultation for the week-long training.
(A) travel
(B) scrutiny
(C) reciprocal
(D) research

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統計: A(16), B(26), C(18), D(12), E(0) #1566304

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reconnaissancethe mi...
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[reconnaissance]: to...
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