Since three months ago, the number of students making notes while listening in class ________ 90％．


  1. A.
    has increased by
  2. B.
    was increased to
  3. C.
    have increased for
  4. D.
    had increased by
A
since three months ago是現(xiàn)在完成時(shí)的時(shí)間狀語(yǔ)，所以句子的時(shí)態(tài)要用現(xiàn)在完成時(shí)。increase by 意思是“增長(zhǎng)了多少”，而increase to為“增長(zhǎng)到(一個(gè)具體的數(shù)字)”。the number of students意思是“學(xué)生的數(shù)目”，謂語(yǔ)動(dòng)詞應(yīng)該用單數(shù)形式。
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Since three months ago, the number of students making notes while listening in class ________ 90％．

[　　]
A．

has increased by

B．

was increased to

C．

have increased for

D．

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