Ⅰ．单句语法填空
1．(2020·新高考卷)The 80,000 objects collected by Sir Hans Sloane, for example, formed the core collection of the British Museum __which/that opened in 1759．
解析：考查定语从句。句意：例如，汉斯·斯隆爵士的8万件藏品构成了1759年开馆的大英博物馆的核心藏品。此处是限定性定语从句，先行词是the British Museum，关系词在从句中做主语，应使用关系代词which/that引导。故填which/that。
2．(2020·天津卷改编)Dr. Rowan, __whose secretary resigned two weeks ago, has had to do all his own typing.
解析：考查定语从句。句意：罗文博士的秘书两周前辞职了，他现在只能自己打字。________ secretary resigned two weeks ago是非限制性定语从句，修饰Dr. Rowan，引导词在从句中作定语，表示“Dr. Rowan’s”，表示“……的”，应用关系代词whose引导该从句。故填whose。
3．(2020·江苏卷改编)Many lessons are now available online, from __which students can choose for free.
解析：考查定语从句。句意：许多课程现在都可以在网上找到，学生们可以从中免费选择。此处是非限定性定语从句，先行词是many lessons，关系词在从句中做介词from的宾语，应使用关系代词which引导。故填which。
