问题补充：
— one and a half months enough for the project to be finished?
—I am afraid not. The professor is ill and only after he recovers go on with it.
A. Is; he can
B. Are; he can
C. Is; can he
D. Are; can he
答案：
A. Is; he can
B. Are; he can
(答案→)C. Is; can he
D. Are; can he
解析：C 考察主谓一致和倒装句。句中主语one and a half months作为一个整体，表示时间，因此谓语部分使用单数形式，排除BD，only+状语 放在句首，后面要使用部分倒装的形式。故C正确。
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