Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions
Tom said to himself, " Why haven't I thought of this before?"
A. Tom wondered why he didn't think of that before
B. Tom wondered why he hadn't thought of that before
C. Tom asked himself why he hadn't thought of this before
D. Tom asked himself why he didn't think of this before
Biến đổi câu hỏi từ trực tiếp sang gián tiếp: giữ nguyên từ để hỏi, sau đó biến đổi các thành phần còn lại về câu trần thuật: I => he ( theo chủ ngữ ); haven’t bought => hadn’t bought; this => that. => Đáp án là B : wonder: phân vân, cân nhắc.