填空题

If Robinson ______ (learn) how to swim, he wouldn’t have been trapped on that island.

【参考答案】

had learned

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热门试题

单项选择题

A. The expansion of existing facilities.
B. The creation of new business.
C. The increase of optimism about the future of economy.
D. All the above.

填空题

The teacher ______ (able) his students to master the new words by making up sentences.