单选题：（　　）wasonceregardedasimpossiblehasnowbecomeareality.

题目内容：

（　　）wasonceregardedasimpossiblehasnowbecomeareality. A．What
B．That
C．Which
D．As

参考答案：

答案解析：

Somethingmusthavehappenedontheirwayhere.Orthey（　　）bynow.

Somethingmusthavehappenedontheirwayhere.Orthey（　　）bynow. A．shouldhavearrived B．

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Younevertoldmeyouhaveseenthefilm,（　　）? A．hadyou B．didn'tyou C．didyou D．weren'ty

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HavingheardsomuchaboutMr.Smith,theywere（　　）tomeetandhaveachatwithhim. A．eager B

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