The teacher was absorbed in writing something, only _____ now and then to refer to a book or another.
A. to stop B. stopped C. stopping D. 
having stopped
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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