He could have finished it on schedule, but he fell behind.
A. somehow
B. anyway
C. somewhat
D. anyhow
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(答案→)A. somehow
B. anyway
C. somewhat
D. anyhow
解析：考查副词：A. somehow不知怎么的，B. anyway不管怎样，C. somewhat有点，D. anyhow无论如何，句意：他原本能按预定进度做完这件事的，但不知怎地却落后了。选A。