[題目] 新多益閱讀題庫大全 P.51
書名:新多益閱讀題庫大全
頁數:P.51
題目:Practice 1 第1題
The technician (working/worked)night and day
to get the security system running.
疑問:這題答案是 worked.
為什麼是worked而不是working?
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