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- 101Earth is believed ____ by an object the size of Mars at some point in the distant past before its surface cooled.
A.to be hit
B.to have hit
C.to have been hit
D.to hit
开始考试练习点击查看答案 - 102______ the exams to worry about, I have to work really hard this weekend.
A.As
B.For
C.With
D.Because of
开始考试练习点击查看答案 - 103According to the companies' websites, the number of active QQ users in China has reached 1 billion, while Qihoo 360 also claims _______ at least 300 million users before June 2010.
A.to have
B.to have had
C.having
D.having had
开始考试练习点击查看答案 - 104The man we followed suddenly stopped and looked as if ______ whether he was going in the right direction.
A.seeing
B.having seen
C.to have seen
D.to see
开始考试练习点击查看答案 - 105-What did you hear last night?-I seemed_________ someone knock at the door.
A.to be heard
B.to be hearing
C.to have heard
D.having heard
开始考试练习点击查看答案 - 106Alice, you were supposed ________ your paper last Sunday. Why haven't you finished it yet?
A.to finishing
B.to have finished
C.finishing
D.having finished
开始考试练习点击查看答案 - 107This book is said ________into several foreign languages last year.
A.has been translated
B.have been translated
C.to have translated
D.to have been been translated
开始考试练习点击查看答案 - 108The split between humans and living apes is thought by some scholars _____ 15 to 20 million years ago.
A.to occur
B.occurring
C.to have occurred
D.having occurred
开始考试练习点击查看答案 - 109China is known _____ greatly in terms of its cultural values over the past few years.
A.to change
B.having changed
C.changing
D.to have changed
开始考试练习点击查看答案 - 110All the books donated by the students from urban schools are said _____ to the students in rural areasthe other day.
A.to be sent
B.being sent
C.having been sent
D.to have been sent
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