第6题 It was not until he arrived at the station __ he realized he had forgotten his ticket.
A.there
B.then
C.that
D.where
【正确答案】：C
试题解析：本句是强调句型。
第7题 If we __ sooner, we might have got there.
A.started
B.had started
C.would have started
D.start
【正确答案】：B
试题解析：这是一个表示与过去事实相反的假设。这种虚拟形式一般是：从句谓语是过去完成时(had done)，主句谓语是would(should，could，might)+have done。
第8题 It is ten years __ Miss Green returned to Canada.
A.that
B.when
C.since
D.as
【正确答案】：C
试题解析：此题考查连词的用法。这是一个固定句型：It is/was+时间+since，其中is可以是has been，was可以是had been。
第9题 For the sake of your health, you should give up smoking __.
A.for sure
B.for all
C.for good
D.for long
【正确答案】：C
试题解析：for sure意为“的确”;for all意为“虽然”;for long=for a long time;for good=forever。因此选C。
第10题 Water always __steam when boiled.
A.gives out
B.gives up
C.gives off
D.gives in
【正确答案】：C
试题解析：give out意为“分发”;give up意为“放弃”;give off意为“发出;放出”;give in 意为“屈服”。
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