He is determined to become a specialist ________ computer when he grows up.
A．forB．inC．onD．a(chǎn)bout
B
考查介詞。in computer在電腦領(lǐng)域。句意：他決心他長(zhǎng)大了成為電腦領(lǐng)域的一名專家。選B。
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