A.when
B.before
C.after
D.since
A.have changed
B.change
C.had changed
D.would change
开始考试点击查看答案A.will be writing
B.will have written
C.have written
D.have been writing
开始考试点击查看答案A.thought
B.would think
C.had thought
D.have thought
开始考试点击查看答案A.had
B.have
C.would have
D.have had
开始考试点击查看答案A.come
B.came
C.am coming
D.was coming
开始考试点击查看答案A.a desert may be dry
B.dry a desert may be
C.may a desert be dry
D.dry may a desert be
开始考试点击查看答案A.that
B.until
C.since
D.before
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