【解析】考查宾语从句。句意：--- Tom刚刚说什么呢？--他问是否今晚我能和他一起去看电影。此处是if引导的宾语从句，句子应该用陈述句语序，且用一般过去时态，故选D。
43．An increasing number of learners are buying online courses in the belief ________ they are much convenient and cheaper.
A. which B. if C. whether D. that 【答案】D
【解析】考查同位语从句。that引导的同位语从句是对前面的抽象名词进行解释说明。此句中横线后的句子便是对前面抽象名词belief的解释说明也不缺成分。故选D。
44．_______ the sun works attracts a lot of students who are interested in astronomy.
A. How B. What C. That D. Why 【答案】A
【解析】考查主语从句。句意：太阳是如何运转的吸引了许多对天文学感兴趣的学生。“_______ the sun works”作主语，是主语从句，从句主谓成分齐全，how“如何”是副词作状语，符合语境。故选A。
45．______the author of the book intends to express is not the loneliness of being trapped on a deserted island but the faith in overing any problem ahead.
A. That B. How C. What D. Why 【答案】C
46．The prize winner described to the class _______ he had managed to achieve excellence in his studies.
A. if B. how C. what D. that
【答案】B
【解析】考查名词性从句。句意：获奖者向他的同班同学描述他是如何在学习中取得成就的。“_______ he had managed to achieve excellence in his studies”是describe的宾语从句，结合句意，该从句应用how引导，表示方式。B选项正确。
47．With private groups, there is a false sense _______ everybody in the groups knows each other and has the same interests in mind.
A. where B. that C. what D. why 【答案】B
48．Facebook is a place where you can share is going on in your life with friends.
A. how B. whether C. that D. what 【答案】D
【解析】句意：Facebook 是一个您在那里可以和朋友分享生活的地方。A. how如何；B. whether是否； C.who谁；D. what……的事情。what is going on? 发生了什么事？由句意可知，选D。
49．The doctor’s dilemma was _____ he should tell the patient the truth. A. whether B. which C. that D. what 【答案】A
【解析】句意为：医生的难处就是他是否应该把真像告诉病人。表语从句不缺成份，而which, what表语从句中必须做主语或者宾语，由此可排除B，D两个选项，而C没有疑问的意思故排除C。whether 是否，符合题意。
50．It is estimated that China has over 770 million 4G users, which doubles ________
it was in 2015.
A. that B. which C. what D. how 【答案】C
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