14. Which of the following sentences is grammatically correct?
(A) She avoided to speak during the meeting.
(B) The lecturer recommended to read a number of books before the exam.
(C) They enjoy to swim in the lake during summer.
(D) I asked to see his identification before I let him into the house.

(A) She avoided to speak during the meeting. ❌

• avoid 後面必須接動名詞：avoid+Ving

• 正確：She avoided speaking during the meeting.

(B) The lecturer recommended to read a number of books before the exam. ❌

• recommend 後面也必須接動名詞：recommand+Ving

• 正確：The lecturer recommended reading a number of books before the exam.
  （若用不定詞，要改成被動語態，如 recommended us to read... 在部分情境可接受，但直接 "recommend to read" 在正式英文中是不正確的）

(C) They enjoy to swim in the lake during summer. ❌

• enjoy 後面只能接動名詞：enjoy+Ving

• 正確：They enjoy swimming in the lake during summer.

• (D) 是對的

  • ask + to + 原形動詞 是正確用法，表示「請求做某事」