Mother wanted to be a good provider, a role she ______ since her marriage to Father.
A．shouldersB．shouldered
C．is shoulderingD．has been shouldering
D

試題分析：考查時(shí)態(tài)。本句的關(guān)鍵是后面的since her marriage to Father，該介詞表示“自從…”要和現(xiàn)在完成時(shí)或者現(xiàn)在完成進(jìn)行時(shí)連用。故D正確。
點(diǎn)評：時(shí)態(tài)題的考查關(guān)鍵是抓住句子的上下文含義和句中的時(shí)間狀語。要根據(jù)時(shí)間狀語來選擇合適的時(shí)態(tài)，在平時(shí)的學(xué)習(xí)中要注意積累有關(guān)時(shí)態(tài)的用法和各種時(shí)態(tài)的特殊之處。如since， so far等經(jīng)常與現(xiàn)在完成時(shí)連用。在條件狀語從句中用一般現(xiàn)在時(shí)代替將來時(shí)等等。
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