1. I can’t find my backpack, and since the last place I had it was the library,
I _________left it there.
(A) must have (B) should have (C) can’t have (D) couldn’t have
should have+p.p. (表過去應做卻未做) It should have rained much more for the last few months because of water shortage. (由於缺水;前幾個月應該多下點雨)---但卻沒下 must have+p.p (表對過去的推測)---過去一定如何.... It must have rained last night because the ground is wet.
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