题目:The computer center, last year, is very popular among the students in this school.
[A、 open, B、 opening, C、 having opened, D、 opened]
喵查答案:[D] ……继续阅读 »
题目:The first textbooks ___ for teaching English as a foreign language came out in the 16th century.
[A、having written, B、to be written, C、being written, D、written]
喵查答案:[D] ……继续阅读 »