He won't be able to see you until an hour later.
例题:
(1)
The colors of a rainbow ---- arranged in the same order.
(A) which are always
(B) and they are always
(C) always
(D) are always
答案:D
解释:空格前是句子的主语,之后是过去分词短语,空格处需要补全句子的谓语,A使原句只有从句无主句;B并列句的前一个分句无谓语;arrange与color是被动关系,C是主动式,可排除;只有D助动词are恰好与arranged构成句子的谓语
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