only if能加doing

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onlyif能加doingonlyif能加doingonlyif能加doing不能.onlyif(whenusedatthebeginningofasentence,makingthevinthefo

only if能加doing
only if能加doing

only if能加doing
不能.only if (when used at the beginning of a sentence,making the v in the following clause precede its subject 用於句首,
後接从句主谓倒装),相当于only on condition that,所以后面只能接从句.

不能。only if (when used at the beginning of a sentence, making the v in the following clause precede its subject 用於句首,
後接从句主谓倒装),相当于only on condition that,所以后面只能接从句。
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