The teacher is busy ____ correcting papers.
A. for B.in C.on D.of
教材全解字詞句篇系列答案科目：高中英語 來源： 題型：
.The teache rfound ____ difficult to decide____ he would take with him to attend the
conference.
A.it;whom B.himself;who C.this;whom D.that;who
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