24. He is very _______ about his chance of winning a scholarship this semester.
A．optionalB．obviousC．optimisticD．conventional
C。 
本題考查形容詞。Optional選修的；obvious顯然地；conventional傳統(tǒng)的。 be optimistic about sth. “對……持樂觀態(tài)度”。句意：他對他這學(xué)期獲得獎(jiǎng)學(xué)金的機(jī)會(huì)非常樂觀。
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