He was told that it would be at least three more months______he could recover and return to work.
A．whenB．before
C．sinceD．that
B
before引導(dǎo)時(shí)間狀語(yǔ)從句，意為“在……之前”，表示他康復(fù)重返工作還至少三個(gè)月時(shí)間。when引導(dǎo)時(shí)間狀語(yǔ)從句，意為“當(dāng)……的時(shí)候”。since引導(dǎo)時(shí)間狀語(yǔ)從句，意為“自從”，表示從某個(gè)時(shí)候一直延續(xù)到現(xiàn)在，常與現(xiàn)在完成時(shí)連用。that用于名詞性從句或定語(yǔ)從句。
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