Simon thought his computer was broken _______ his little brother pointed out that he had forgotten to turn it on.
A．untilB．since?
C．a(chǎn)fterD．because?
A?
本題考查連詞。根據(jù)句意他一直以為電腦壞了，直到他弟弟告訴他忘記開機了；not...until...意為“直到……才”。
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