76.I doubt _______ they can complete the bridge ahead of time.
A. whether B. that C. why D. what
77.The question he asked was _______ I come here.
A. that B. how C. what D. because
78.Too many people are indifferent _______ others‘ troubles.
A. with B. to C. of D. about
79.Let us see how dictionaries are made and how the editors _______ definitions.
A. lead to B. arrive at C. reach for D. approach to
80.Shanghai is the place _______ I was born.
A. on which B. in which C. when D. that
参考答案：
76.正确答案：A答案解析：doubt 用在肯定句中，之后的宾语从句用 whether 或 if 引导。用在否定句中，后接宾语从句用 that 引导。
77.正确答案：B答案解析：这里表示的是：来的方式，要用how.
78.正确答案：B答案解析：indifferent，形容词，“漠然的、冷淡的”，常用indifferent to.
79.正确答案：B答案解析：本题考查词义辨析。arrive at：获得(结果);达到(目的)。
80.正确答案：B答案解析：出生在某地，要用介词in.此句话中，in which=where.
