Spring has came to Portland at last. The sky is blue.【M1】______ Birds are singing on the trees, flowers are blooming, and【M2】___

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问题     Spring has came to Portland at last. The sky is blue.【M1】______
Birds are singing on the trees, flowers are blooming, and【M2】______
everyone are in a good mood. Spring has always been【M3】______
a busy time for college students in Portland. They had【M4】______
to take final examinations and hand out their term papers.【M5】______
Most of students who have been living in the dorms【M6】______
will soon be packing their things to move back to home【M7】______
for summer vacation. Of course, many students will be【M8】______
looking for job during the summer and other students will【M9】______
remain in campus to take courses.【M10】______
【M4】

选项

答案had--have

解析 这里是陈述一般情况,年年如此,要用一般现在时。
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