题目
题型：不详难度：来源：
_________ it was to become was a mystery until the dust began to slowly combine into a ball moving around the sun.
| A．That | B．What | C．Which | D．Whether |
答案
解析
核心考点
试题【._________ it was to become was a mystery until the dust began to slowly combine】；主要考察你对句法等知识点的理解。[详细]
举一反三
.It is reported that two exhibition centres, ____are being built in my city, will
open next year.
| A．they both | B．both of which |
| C．which both | D．both of them |
His parents thought he was working very hard in the room, _____in fact, he was chatting with his friends on the Internet.
| A．when | B．where |
| C．which | D．while |
-- I find it fun and challenging. It is a job ________ you are doing something serious but interesting.
| A．that | B．which | C．when | D．where |
They will fly to Washington, ______they plan to stay for two or three days.
| A．which | B．where | C．there | D．when |
Most business letters and government reports are the main situations _________ formal language is used. ^*
| A．where | B．that | C．what | D．which |
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