【題目】Mary is so quiet a girl that she seldom speaks in public places unless _____ to.

A. is spoken B. is speaking

C. speaking D. spoken

【答案】D

【解析】狀語從句的省略必須滿足兩個(gè)條件，狀語從句的主語和主句的主語一致，且狀語從句中含有be動詞；在這時(shí)可以把狀語從句的主語和be動詞一起省略。本句在unless后面省略了she is；句意：Mary是一個(gè)十分安靜的女孩，以至于在公眾場所，如果別人不和她說話，她很少說話。根據(jù)句意可知she和speak to之間構(gòu)成被動關(guān)系。故D正確。

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