Question

(2013·河北教学质检)After a year, doctors diagnosed him with a disease so rare ________ it affects just one in 8 million children.

A．after

B．that

C．as

D．since

Answer 1

B

B　句意：一年以后，医生诊断出他患了一种很罕见的疾病，这种病如此罕见以至于八百万孩子中只有一个孩子可能会得此病。句中so rare判断设空处用that，构成“so...that...”句型。