It was three years_______ he came back.
A．thatB．sinceC．beforeD．when
C

試題分析：考查連詞的用法區(qū)別。若選 “since”,則主句應(yīng)為現(xiàn)在完成時；若選“that”則 “three years”要帶有介詞變?yōu)闀r間狀語才能用于強調(diào)句對其進行強調(diào)；D項如果It was 之后為時間點，且it為時間，則可以選；it was+時間段+before 從句，且前后時態(tài)要保持一致，表示過多久才、、、；故C正確。
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