单项选择题

Because fuel supplies are finite and many people are wasteful, we will have to install ______ solar heating device in our home.

A. some type of
B. some types of a
C. some type of a
D. some types of
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单项选择题
Since the early nineties，the trend in most businesses has been toward on-demand， always-available products and services that suit the customer’s ______ rather than the company’s．
A．benefit
B．availability
C．suitability
D．convenience
单项选择题
The meeting was put off because we ______ a meeting without John.
A. objected having
B. were objected to having
C. objected to have
D. objected to having
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