题目

86. __________（在……之前）to the meeting, we had discussed the matter among ourselves. 87. I can’t figure out what you are saying. Would you please make it ___________（清楚的）? 88. One of the ____________ （缺点, 不利条件）of this approach is that the words must be registered in the system beforehand.  89. Do remember to have your clock ___________（上发条）up, as the ceremony will be held on schedule. 90. Professor Kalan called his ______________（助理）, Hashim and Thomas, to take over while he went out. 91. Last Sunday, they held a ___________（But when I got ____ the town ought to have been, all I found was a gas station. A. what                                 B．which                    C．where      D．that