问题补充:
A number of students trees every year and the number of them increasing.
A. plant; is
B. plants; is
C. planting; is
D. planting; are
答案:
(答案→)A. plant; is
B. plants; is
C. planting; is
D. planting; are
解析:本题考查number of的用法。a number of为量词短语,表示“许多……”,中心词是这个短语所修饰的复数名词,所以作主语时,谓语动词用复数形式。the number of表示“……的数量”,后接复数名词,其中,中心词为number,因此谓语动词用单数。
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