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单项填空（共15小题，每小题1分，满分15分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21. The new building will be built _________ was a wasteland 30 years ago.
A. in what B. where C. in which D. there
22. --- Do you still remember when we went to Nanjing?
--- I can’t remember now but _________ sometime last summer?
A. might it be B. could it be
C. could it have been D. should it have been
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21. The new building will be built _________ was a wasteland 30 years ago.
A. in what B. where C. in which D. there
22. --- Do you still remember when we went to Nanjing?
--- I can’t remember now but _________ sometime last summer?
A. might it be B. could it be
C. could it have been D. should it have been
