[文法] was extending vs. has extended
When Johns Hopkins University in 1876 joined undergraduate education with the
most advanced graduate instruction and research, American education ________
its reach toward the farthest frontiers of scientific and scholarly discovery.
_______中可填入的選項有:
(A) is extending (B) was extending (C) has extended
(D) had being extended
答案為:(B) was extending
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我想請問為什麼(C) has extended 不行呢??
謝謝
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