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王老师:19139051760(拨打)
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第1题

A computer can only do ___ you have instructed it to do. A. how B. after C. what D. when
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第2题

We also use other forms of communication ________ we may be aware or unaware. A. to which B. of which C. which D
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第3题

It ________ around nine when I drove back home because it was already dark. A. had to be B. was to be C. must have
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第4题

泄槽中的水流处于( )状态。
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