问题
_______ 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
B:Are; he can
C:Is; can he
D:Are; can he
正确答案是：
