单项选择题

（）that they may eventually reduce the amount of labor needed on construction site by 90 percent.

A. So clever are the construction robots
B. So clever the construction robots are
C. Such construction robots are clever
D. Such clever construction robots are

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单项选择题

（） you as soon as I know what（）

A. I’ll phone.., does happen
B. I’ll phone.., has happened
C. I am phoning.., happens
D. I am going to phone.., happens

单项选择题

The letter seemed（） by a child.

A. to have written
B. to write
C. to be writing
D. to have been written