all his hard work he still failed to finish the task in time.A. AlthoughB. Even ifC. Eve

问题补充：

all his hard work, he still failed to finish the task in time.

A. Although

B. Even if

C. Even after

D. So long as

答案：

A. Although

B. Even if

C. Even after

(答案→)D. So long as

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