[題目] 寂天滿分閱讀第五回
書名:寂天挑戰新多益閱讀滿分
版本:寂天
頁數:p.134 第144題
題目:
If, for any reason, you are not satisfied, simply return your purchase
with receipt for an exchange or refund wihtin 90 days when______ on
your Sears Card, Sears MasterCard, or Sears Gift Card.
(A) purchase
(B) purchasing
(C) purchased
(D) purchases
疑問:為甚麼是C而不是B?
是 when it is purchased on 的 it is被省略嗎?(亂猜中)
謝謝
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