[文法] TOEIC一題文法題目

[QQ29 (徵床伴)]

01. For several years now, we have seen a marked _____ in attendance and
exhibitions at the PCB design conferences.
  (A) increase     (B) increased    (C) increasing  (D) TO increase

題意就有點看不懂了
但是答案是A
請問一下為什麼呢??
thx^^

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