Question

when he came back from school

It was ＿＿＿ he came back from school today ＿＿＿ he found his new book missing. A．when; then B．not; until C．not until; that D．only; when

Answer 1

C 考查强调句型。句意“直到今天他从学校回来，他才发现他的新书不见了。”It is ...that是强调句型，可以强调除谓语外的任何成分，把强调句型去掉，不影响句意。故选C。