Hard ________ he tried,he was unable to meet the deadline for the term paper.A.although B.asC.if D.since

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Hard________hetried,hewasunabletomeetthedeadlineforthetermpaper.A.althoughB.asC.ifD.sinceHard_______

Hard ________ he tried,he was unable to meet the deadline for the term paper.A.although B.asC.if D.since
Hard ________ he tried,he was unable to meet the deadline for the term paper.
A.although B.as
C.if D.since

Hard ________ he tried,he was unable to meet the deadline for the term paper.A.although B.asC.if D.since
B.
=No matter how hard he tried