[題目] 國際學村閱讀題庫大全 P.217
書名:閱讀題庫大全
版本:
頁數:p.217 第三題
題目:
Please refer to the enclosed manual or call one of our technicians
______ you are unable to fine-tune your device.
(A) unless
(B) while
(C) whether
(D) if
正解為D if
疑問:if解釋成如果的話,是符合題意的。但為何B不行呢?解釋成當~的時候不行嗎?
感謝解答~
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