________ for the fact that she broke her leg, she might have passed the exam.
A．Hadn't it been B．Had it not been
C．Was it not D．Were it not
B
選B　句意：要不是她摔斷了腿，她可能就通過考試了。根據(jù)題干中的broke, might have passed可推知設(shè)空處為與過去事實(shí)相反的虛擬語氣。與過去事實(shí)相反，if從句謂語動(dòng)詞應(yīng)為“had＋過去分詞”，故排除C、D兩項(xiàng)；如果虛擬語氣的if從句為否定句，省略if時(shí)，只需將助動(dòng)詞、were或情態(tài)動(dòng)詞提前構(gòu)成倒裝，而否定詞not需保持在主語之后，故排除A項(xiàng)。
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