求教四道英文單選求解析.請(qǐng)進(jìn)!
【1】
Every means_____tried but witout any result.
A、have been
B、is to be
C、are to be
D、has been
答案是選D.但我不理解為什么用has,總覺(jué)得every means是復(fù)數(shù)（并非初中every的問(wèn)題,我能理解every body是單數(shù)）.請(qǐng)順便幫我介紹一下every twins和every twinses的區(qū)別.
【2】
There____a pen,two pencils and three books on the desk.
A、are
B、is
C、has
D、have
為什么?后面“a pen,two pencils and three books”不是用and連接嗎?按我的理解應(yīng)該是復(fù)數(shù)才對(duì),答案為什么是單數(shù)?
【3】
A large number of students in our class____girls.
A、are
B、was
C、is
D、be
是否a large number of等同于most of?large number of的用法.numbers of、a number of、the number of的區(qū)別.
【4】
The number of deer,mountain lions and wild roses____much if people leave things as they are.
A、doens't change
B、don't change
C、change
D、changed
我的理解是：if people leave things as they are說(shuō)明這句是虛擬語(yǔ)氣,因此選擇D.但是答案是A,為什么?