题目内容

When ____________ , ice will be changed into water.

A. heating
B. heated
C. having been heated

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____________ the cause, we were able to propose a remedy.

A. having found
B. to find
C. finding

Not _________her address, we couldn’t get in touch with her.

A. known
B. knowing
C. to know

_____________ by mistakes and setbacks, we have become wiser and handle our affairs better.

A. having been taught
B. teaching
C. to teach

He dropped the plate,____________ it into pieces.

A. to break
B. having broken
C. breaking