45 Scientists say it may be five or six years __ it is possible to test this medicine.
A. since
B. after
C. before
D. when
答案: C
解析:本题考查since与before等连词的用法。
46 Jasmine was holidaying with her family in a parks __ she was bitten on the leg by a lion.
A. when
B. while
C. since
D. once
答案: A
解析:本题考查when有“就在这时”之意,作并列连词用。
47 Parents should take seriously their children’s requests for sunglasses __ eye protection is necessary in sunny weather.
A. because B. though
C. unless
D. if
答案: A
解析:此句意思为“如果在阳光强的天气中眼保护有必要的话,父母应该认真地对待孩子们戴墨镜的要求”,应选表原因意味,没有让步及条件意味,故选A.
48 We were told that we should [ollow the main road
__ we reached the central railway station.
A. wheneve
B. until
C. while
D. wherever
答案: B
解析:until译为“直到……”。
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