第一節(jié):語法和詞匯知識(共15 小題;每小題1分,滿分15分)
從A、B、C、D四個選項中,選出可以填入空白處的最佳選項。
例: We ______ last night, but we went to the concert instead.
A. must have studied B. might study
C. should have studied D. would study
答案是C。
21. Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight against SARS, so we had not enough time for a talk.
A. just left B. has just left
C. is just leaving D. was just leaving