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问题

lay an important role inmodern life, but they ______ also cause many problems like air pollution.

A:should
B:can
C:must
D:will
正确答案是:
同类题型

Is everyone here today — No . Mark __________ his leg in the basketball game yesterday .

MrSmith was very disappointed to see the car he had had _____ went wrong again

rl had hardly rung the bell the door was opened suddenly, and her friend rushed out to greet her.

Nowadays, a large number of women, especially those from the countryside, ________ in the clothing industry

Arriving home,the boy told his parents about all the________which occurred in his dormitory.

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