问题描述：
______difficult _____him ______the project on time .
A.it's ; to ; finish
B.he is ; for; to finish
C.it's; for; to finish
D.that's ; to ; finish
A.it's ; to ; finish
B.he is ; for; to finish
C.it's; for; to finish
D.that's ; to ; finish
问题解答：
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