It ________ nearly two weeks ______ I had received his letter.
A．is, thatB．was, thatC．is sinceD．was, since
D
since，for作為連詞，引導(dǎo)時間狀語（從句）如果謂語動詞是延續(xù)性的一般過去時，其表達的含義是"從這個動作結(jié)束以來"，恰好和動詞的詞義相反，具有否定的含義；如果謂語動詞是非延續(xù)性的一般過去時，其表達的含義是"從這個動作開始以來"，恰好和動詞的詞義一致，具有肯定的含義
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