5.I can't help________the cleaning________I'm busy making some dumplings now.
A.doing; because
B.to do; now that
C.doing; since D.to do; therefore
答案:B 本题考查非谓语动词及连词的用法。本题很容易误选A,误认为是can't help后就跟动名词。句意:我不能帮助大扫除,因为我现在正忙着包饺子。从I'm busy making some dumplings now来看,此处help应为“帮助”,can't help(to)do sth. 表示“不能帮助做某事”;now that意为“既然”,表示原因。
6.The study shows that the________scenes in movies and TV are harmful________children.
A.cheerful; for
B.violent; to
C.disappointing; for
D.touching; for
答案:B 本题考查形容词辨析及介词用法。violent“暴力的”,violent scenes“暴力场景”;be harmful to...意为“对……有害”。
7.Some policemen were sent there to__________the villagers________the trees.
A.keep; cutting down
B.prevent; cutting down
C.prevent; to cut up
D.stop; to cut up
答案:B prevent/stop...(from)doing sth.表示“阻止……做某事”,不能说prevent/stop...to do sth.。keep...from doing sth. 也有“阻止……做某事”的意思,但from不能省略。
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