________ it carefully can we hope to find a way to solve the challenging problem.
A.When we observe
B.When to observe
C.That we should only observe
D.Only by observing
试卷相关题目
- 1Just in the centre of our city ________ with a history of 1000 years.
A.stands a tall tree
B.does a tall tree stand
C.a tall tree is standing
D.a tall tree stands
开始考试点击查看答案 - 2Seeing the guard coming, away ________.
A.the two boys ran
B.were the two boys running
C.ran the two boys
D.did the two boys run
开始考试点击查看答案 - 3Rarely ________ so difficult a choice in her whole life.
A.she could have faced with
B.could have she faced with
C.she could have been faced with
D.could she have been faced with
开始考试点击查看答案 - 4Sometimes when I go on a business trip, the night in the hotel room is the only moment when I have time for myself.Only then ________ magazines or a novel.
A.I can read
B.I could read
C.can I read
D.could I read
开始考试点击查看答案 - 5Seldom ________ out time to watch TV on Sunday.
A.I can squeeze
B.can I squeeze
C.squeeze I
D.I squeeze
开始考试点击查看答案 - 6Rarely ________ nowadays; nobody knows where he is and whether he comes back.
A.we see him
B.do we see him
C.we do not see him
D.do we not see him
开始考试点击查看答案 - 7Not until we had stayed together for a couple of days ________ we had a lot in common.
A.I found
B.that I found
C.did I find
D.had I found
开始考试点击查看答案 - 8Old ________ he is, he leads an active life.
A.although
B.so
C.as
D.even if
开始考试点击查看答案 - 9In the 1980's, the Walkman was hugely popular and ________ when CDs arrived.
A.so the Discman was
B.the Discman was so
C.so was the Discman
D.was so the Discman
开始考试点击查看答案 - 10Nowhere else in the world ________ more attractive country scenery than in w Wales.
A.you enjoy
B.can you enjoy
C.you can enjoy
D.enjoy you
开始考试点击查看答案