题目内容
He made a promise ________he earned money, he would build a new school to help develop education.
| A.what | B.that if | C.that | D.what if |
B
B [that引导promise后的同位语从句,if引导同位语从句中的条件状语从句。]
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| A.what | B.that if | C.that | D.what if |