______ the teacher has given permission, ______allowed to use the equipment in the lab.
A．Only if, are the studentsB．If only, the students are
C．If only, are the studentsD．Only if the students are
A

試題分析：句意：只要老師答應(yīng)，學(xué)生被允許使用實(shí)驗(yàn)室的設(shè)備。這里是only修飾if的從句放在句首時(shí)，句子的主句用部分倒裝，故選A。
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