從A、B、C、D四個(gè)選項(xiàng)中，選出可以填入空白處的最佳選項(xiàng)。

I won't call you, ________ something unexpected happens.


  1. A.
    unless
  2. B.
    whether
  3. C.
    because
  4. D.
    while
A
解析：
思路
分析：句意是：如果不發(fā)生意外情況，我就不給你打電話。顯然，從句是主句的一個(gè)條件，故用unless．引導(dǎo)條件狀語(yǔ)從句。whether與or not搭配表示“不管……還是……”，because表示原因；
while表示時(shí)間或讓步，均在意義上不合題意�！军c(diǎn)評(píng)】該題考查狀語(yǔ)從句的引導(dǎo)詞，偏難。狀語(yǔ)從句引導(dǎo)詞的選擇必須看主句和從句之間的邏輯關(guān)系，同時(shí)參考連詞的具體含義而定。
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