题目内容

【单选题】While __________ the article, I was wondering whether e-books would replace print books soon.

A. reading
B. read
C. was reading
D. to read

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【单选题】It was not until the 1990s __________ industrial robots became really cheap, and therefore a possible option.

A. which
B. who
C. whom
D. that

【单选题】When you finish __________ your questions, simply press the Enter key.

A. type
B. typing
C. to type
D. typed

【单选题】__________ career you choose, effective communication skills will serve you well.

A. Whenever
B. Wherever
C. Whatever
D. However

【单选题】According to the contract, this project __________ within four months starting from today.

A. will be completed
B. completes
C. has completed
D. was completed