单项选择题

(According to) our estimate, only one (out of) three company managers (have been) trained (in the field of) management.

A．According to
B．out of
C．have been
D．in the field of
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单项选择题
(Collecting toy cars) as a hobby (becomes) increasingly (popular) during (the past fifty) years.
A．Collecting toy cars
B．becomes
C．popular
D．the past fifty
单项选择题
Lewis (had to) travel (by bus) as his car (had been damaged) in an accident some days before and he (was failed) to get it repaired.
A．had to
B．by bus
C．had been damaged
D．was failed
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