To design new machines and to take charge of the project______his job.

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问题 To design new machines and to take charge of the project______his job.

选项 A、is
B、are
C、does
D、do

答案B

解析 本句的主语有两个To design:new machines和to take charge of the project,这两个主语用“and”连接,构成并列主语。
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