The student worked , but, to our disappointment, he still failed in the final ex
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The student worked ________, but, to our disappointment, he still failed in the final examination．
A.as hard as possible
B.as hard as possibly
C.as hard as he can
D.so hard as he could
试题答案
A
表达“尽可能……”时，可用“as…as possible”或“as…as sb．can/could”。从本句中动词所表示的时间来看，结构中应用过去时态，故排除C项。