填空题

Scientists think laser (be) ______ one of the most useful tools today.

【参考答案】

to be
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单项选择题
A．IBM.B．A supermarket.C．ABC Company.D．A bookstore.
A．IBM.
B．A supermarket.
C．ABC Company.
D．A bookstore.
填空题
He is now accustomed to (walk) ______ to work everyday.
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