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D.if 【點評】考查連詞辨析,首先識記連詞詞義,然后根據(jù)句意確定。D.C.B.29.___________ the situation in Iraq is very dangerous, the woman reporter still keeps on working there. A.根據(jù)it39。soB.28.— What subject do you prefer? — I prefer science ________________ it39。此外,它更環(huán)保,因為它使用電力。Even thoughWhat39。s much greener because it uses electricity. A.as soon as,一……就……;if,如果;while,當(dāng)……時候;until,直到,not...until...,直到……才……,故選D。whileB. 【點評】考查連詞辨析。D.C.B.25.A ship is safe if it stays in a harbor. But this is not ________ it is built for. A.since自從,與完成時連用;till直到,not until直到……才;while當(dāng)……時候,與進(jìn)行時連用。C.24.—When did you know there would be an important meeting? —_______ Sandy called me this morning.A.、又、和,既可以表示并列也可以表示遞進(jìn)。C.B.you will be healthier. A.;......否則;......之后;。B.ift feel happy,感覺不開心是轉(zhuǎn)折關(guān)系,but但是,表轉(zhuǎn)折,故選C。C.or 【點評】考查連詞辨析,首先識記連詞詞義,然后根據(jù)詞義和句意確定。C.if 【點評】考查連詞辨析。D.but祈使句+and/or+句子,固定搭配,根據(jù)句意可知是努力學(xué)習(xí),否則會失敗,故選D。D.B.故答案是D。D.whenthoughbecauseC.t play puter games __________ he finishes his homework. A.soB.D.althoughD.C.B.s not so difficult. A.Thereforebecause【答案】 C 9.Mark felt very bad today. __________, he kept working all day and said nothing about it.