单选题
17.
______ children have been taken out of school and taught by their parents at home.
A、
A number of
B、
A great deal of
C、
An amount of
D、
The number of
【正确答案】
A
【答案解析】
a number of后面跟复数，同时谓语动词用复数形式；a great deal of和an amount of后面接不可数名词；the number of后面的谓语动词应该是单数形式。
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