A just have had B have just had C just had D had just had
when 还可以表示①刚..就 、②恰在此时;
44. I had just started back for the house to change my clothes _D_ I heard voices.
A as B while C after D when
45. I felt somewhat disappointed and was about to leave, _C_ something occurred which attracted my attention.
A unless B until C when D while
64. It was essential that these application forms _D_ back as early as possible.
A must be sent B will be sent C are sent D be sent
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