—I can’t find Xiao Ping, where did you see him this morning?—It was in the library______ he studied．A.thatB.whereC.whichD.the one
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B解析本句是省略了that的强调句型。在被强调部分中library后有一定语从句，补充完整应为It was in the library （where he studied ）that I saw him this morning.我们在平时的训练中一定要注意强调句型的这一用法。