27．—I can’t find Fred．He is not at home． —Why don’t tryhim?A. phoningB. to phoneC. phoneD.

问题补充：

27．—I can’t find Fred．He is not at home．

—Why don’t tryhim?

A. phoning

B. to phone

C. phone

D. having phoning

答案：

(答案→)A. phoning

B. to phone

C. phone

D. having phoning

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