while you_____your trip,I was busy______for my exam a.enjoy;prepare b.enjoyed;preparec.were enjoy;preparingd.were enjoying;preparing

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whileyou_____yourtrip,Iwasbusy______formyexama.enjoy;prepareb.enjoyed;preparec.wereenjoy;preparingd.

while you_____your trip,I was busy______for my exam a.enjoy;prepare b.enjoyed;preparec.were enjoy;preparingd.were enjoying;preparing
while you_____your trip,I was busy______for my exam a.enjoy;prepare b.enjoyed;prepare
c.were enjoy;preparing
d.were enjoying;preparing

while you_____your trip,I was busy______for my exam a.enjoy;prepare b.enjoyed;preparec.were enjoy;preparingd.were enjoying;preparing
答案是：
D
while是当.时,所以用进行时~
看到句子的时态是过去时
所以前面用过去进行时~
be busy +doing
是固定用法~
忙于做某事~

d
sb is busy doing, 可以排除a,b
c中用的过去进行时，were enjoy是错的，所以选d

选d 句意：当你在享受旅行时，我正忙着准备考试。
分析如下：有句意可知主句和分句同时发生，故第一个空选过去进行时：后面是个固定句式 be busy (with )
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正确：d
while后接延续性动词，而且比较多使用过去进行时。be busy doing....忙于做……

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